IN THE SUPREME COURT OF THE STATE OF DELAWARE 

CHRISTINA ZAYAS, §

§ No. 232, 2021

Claimant Below/Appellant, §

§

v. § Court Below: Superior Court

§ of the State of Delaware

STATE OF DELAWARE, §

§

Employer Below/Appellee. § C.A. No. N20A-03-006

Submitted: January 26, 2022

Decided: March 7, 2022

Before VALIHURA, VAUGHN, and MONTGOMERY-REEVES, Justices. 

Upon appeal from the Superior Court. REVERSED and REMANDED.

Gary S. Nitsche, Esquire, Joel H. Fredericks, Esquire, Weik, Nitsche & Dougherty, LLC, 

Wilmington, Delaware for Appellant. 

John J. Klusman, Esquire, Megan E. Traynor, Esquire, Tybout, Redfearn & Pell, 

Wilmington, Delaware for Appellee. 

VALIHURA, Justice: 
2

Claimant Christina Zayas (“Zayas”), a paratransit bus driver, sued her employer, 

DART/State of Delaware (“Employer”), for injuries she sustained in a 2016 work incident 

where a passenger physically assaulted her (the “Incident”).

1

 Zayas sustained multiple 

injuries during the Incident. On May 2, 2019, Zayas underwent left shoulder arthroscopic 

surgery performed by Dr. Evan Crain (“Dr. Crain”).

2

 After the surgery, Zayas was placed 

on total disability from May 2019 through October 2019. 

Zayas filed Petitions to Determine Additional Compensation Due (the “Petitions”)

relating to the Incident. Specifically, Zayas’ Petitions sought payment of medical 

expenses, total disability benefits, and acknowledgement of the compensability of the 

surgery Dr. Crain performed in 2019. Zayas’ hearing was scheduled for November 14, 

2019 (the “Hearing”). Prior to the Hearing, the parties stipulated that the limited issue in 

dispute was whether the May 2, 2019 surgery was causally related to the Incident. 

On October 1, 2019, Zayas deposed Employer’s medical expert, Dr. Gregory 

Tadduni (“Dr. Tadduni”). At the deposition, Dr. Tadduni refused to answer questions 

concerning the treatment Zayas received from Dr. Damon Cary (“Dr. Cary”). Dr. Tadduni 

refused to discuss anything related to Dr. Cary because at the time of the Hearing, 

disciplinary charges were pending against Dr. Cary alleging that he had “fraudulently 

submitted bills to insurance carriers for physical examinations, medical discussions, and 

1 A006 (IAB Decision at 6 dated March 20, 2020, hereinafter, “IAB Decision”). 

2 A002 (IAB Decision at 2). Dr. Crain’s preoperative diagnosis was of a traumatic rotator cuff 

tear with post traumatic impingement syndrome. A011 (IAB Decision at 11).
3

diagnoses of medical complaints that never occurred.”3 However, none of those allegations 

involved his treatment of Zayas. Dr. Tadduni’s repeated refusal to testify concerning Dr. 

Cary’s treatment of Zayas prompted Zayas’ petition on October 7, 2019, requesting that

the Board exclude Dr. Tadduni’s testimony at the Hearing. 

On the day of the Hearing, the Board denied Zayas’ request to exclude Dr. Tadduni’s

testimony. The Board explained that the prejudice to the Employer in excluding Dr. 

Tadduni’s testimony outweighed any prejudice to Zayas.

At the Hearing during Zayas’ direct examination, Zayas’ counsel sought to admit 

Dr. Cary’s medical records (“Medical Records”) because the records contained evidence 

of Zayas’ left shoulder pain between September 15, 2016 and July 26, 2018.4 Employer 

objected, arguing that Zayas was not in a position to authenticate the Medical Records and 

that the information contained in the Medical Records was not credible due to Dr. Cary’s 

pending disciplinary matter. After a short discussion off the record, the Board returned 

and sustained the Employer’s objection to the admission of the Medical Records.5 

After the Hearing, the Board issued its written decision (the “IAB Decision”). The 

Board held that Zayas had failed to meet her burden of proof that the surgery in 2019 was 

causally related to the Incident. Specifically, the Board stated, “the evidence [did] not 

support that [Zayas] presented with pain upon rotator cuff testing within close proximity 

3 A003 (IAB Decision at 3).

4 A061 (IAB Hr’g Tr. at 38). 

5 A064 (IAB Hr’g Tr. at 41).
4

to the assault or in Dr. Cary’s records.”6 Notably, although the Board had excluded them, 

the Board stated in its Decision that the Medical Records were admissible. It stated:

The charges against Dr. Cary are pending. Dr. Cary has not been found 

guilty. There was no evidence that the allegations against Dr. Cary involved 

[Zayas’] case. The treatment Dr. Cary provided to [Zayas] was not at issue 

or disputed but rather accepted as reasonable and necessary. The content of 

Dr. Cary’s records in this case is admissible evidence. During crossexamination, Dr. Tadduni repeatedly testified that he would not accept the 

validity of or acknowledge anything Dr. Cary documented because of the 

reasons Dr. Cary’s medical license was suspended. The latter is the basis 

for [Zayas’] motion.7

However, a review of the record indicates that the Medical Records were never 

admitted into evidence. The Superior Court did not consider this apparent inconsistency, 

or the issues Zayas had raised regarding the medical testimony and records. Nevertheless, 

the Superior Court affirmed the Board’s decision and found that substantial evidence 

existed to support the Board’s legal conclusions. 

On appeal, Zayas again argues that the Board committed legal error by not admitting 

her Medical Records and that it abused its discretion by admitting Dr. Tadduni’s deposition 

testimony during the Hearing.

We conclude that Dr. Tadduni’s refusal to answer relevant questions deprived Zayas 

of the opportunity to elicit relevant information. In essence, Dr. Tadduni unilaterally 

determined that he would not answer questions concerning Dr. Cary’s treatment of Zayas. 

In admitting Dr. Tadduni’s testimony, and simultaneously excluding the Medical Records, 

6 A020 (IAB Decision at 20) (emphasis added). 

7 A003 (IAB Decision at 3) (emphasis added). 
5

the Board’s actions prevented Zayas from adequately presenting her case, violated 

fundamental notions of fairness, and thereby abused its discretion. 

Although the Board’s ultimate conclusion was based, in part, on credibility findings 

of other witnesses, we are of the view that the process was so flawed that it is difficult for 

us to have confidence in the outcome. As a result, we REVERSE and REMAND for 

proceedings consistent with this decision.

I. Factual and Procedural Background

On September 2, 2016, Zayas sustained injuries while she was working as a 

paratransit bus driver for DART. At a scheduled stop, a male passenger assaulted a 

passenger sitting in front of him. The assailant was a large adult male with a mental 

disability. After the male (assailant) passenger got off the bus, Zayas exited the bus to 

escort him as required by her employment.8 While Zayas stood in front of the bus, he

assaulted her. Zayas attempted to get back into the bus, but the assailant punched her

repeatedly in her face, neck, and head. Zayas fought back and eventually fell to the ground. 

After she fell to the ground, the assailant continued to beat her. As a result of her injuries, 

Zayas received medical treatment. 

8 A review of what has been described as footage of the Incident, described in the IAB record as 

Exhibit 7, reveals that incorrect video footage has been included in the record provided to this 

Court. The video footage included in the Appendix filed with this Court instead shows events that, 

according to the timestamp affixed to the video footage, transpired on October 23, 2020 at 5:01 

p.m. This video does not show footage of the Incident as described by the IAB/Board and Superior 

Court below. 
6

After the Incident, Zayas was treated by three different doctors: Dr. Cary, Dr. Adam 

Ginsberg (“Dr. Ginsberg”), and Dr. Crain.9

Zayas began having problems with both shoulders following the Incident and began 

treating with Dr. Cary. Zayas estimated that between September 15, 2016 and July 26, 

2018, she treated with Dr. Cary forty-three times. During each of these visits, according 

to the Medical Records, Zayas presented with left shoulder complaints.10 Dr. Cary 

attributed Zayas’s upper extremity complaints to her neck.11 However, Zayas continued to 

experience left shoulder symptoms throughout the course of treatment with Dr. Cary. In 

August 2018, Dr. Cary referred Zayas to Dr. Ginsberg. 

Zayas complained to Dr. Ginsberg that she could not move her arm. She “described 

the pain as being like crushed glass.”12 Dr. Ginsberg confirmed that some of Zayas’s issues 

stemmed from her neck. Despite this, Dr. Ginsberg suspected shoulder involvement and 

gave Zayas an injection in her shoulder. Within five minutes of receiving the injection, 

Zayas was able to move her left arm freely, lift things without pain, and otherwise had 

complete relief. Zayas rated her pain at a zero on a ten-point scale. Thereafter, Dr. 

Ginsberg referred Zayas to Dr. Crain to treat her left shoulder.

9 A006–07 (IAB Decision at 6–7). Zayas was involved in two prior work accidents -- one in 2011 

and one in 2014. For those two prior incidents, Zayas was treated by Dr. Cary and Dr. Ginsberg. 

A006. 

10 A006 (IAB Decision at 6). Zayas confirmed that she raised left shoulder complaints at these 

visits when she testified after reviewing the Medical Records. 

11 Id.

12 A007 (IAB Decision at 7). 
7

On September 27, 2018, Zayas met with Dr. Crain for the first time. After an 

examination, Dr. Crain “summarized that [Zayas] had shoulder pain, pain with rotator cuff 

maneuvers and impingement maneuvers, but [Zayas] had much less pain than she had prior 

to receiving the injection.”13 On February 14, 2019, Zayas underwent an MRI of the left 

shoulder. Upon review, “Dr. Crain thought there was a high-grade bursal surface rotator 

cuff tear, almost full thickness but no major retraction.”14 Dr. Crain’s main findings were 

abnormalities of the rotator cuff suggestive of a rotator cuff injury and a tear. He reviewed 

the MRI results with Zayas on April 15, 2019. After an examination, Dr. Crain 

recommended surgery as he believed that Zayas suffered from a traumatic rotator cuff tear 

with posttraumatic impingement syndrome.

On May 2, 2019, Dr. Crain performed the surgery. Intraoperatively, he noted a 

complete tear of the supraspinatus, a loose flap of labrum consistent with a Type I tear, and 

a partial tear of the biceps. “Dr. Crain debrided the structures, repaired the rotator cuff and 

did an arthroscopic decompression.”15 According to Zayas, the surgery was successful in 

curing her shoulder issues.

On September 24, 2019, Dr. Crain was deposed by Zayas’s attorney and the 

Employer’s attorney. During his deposition, Dr. Crain confirmed the following: (i) he had 

examined Dr. Cary’s records and Dr. Cary mentioned in the Medical Records that on every 

13 A010 (IAB Decision at 10).

14 A011 (IAB Decision at 11). 

15 Id.
8

visit, Zayas had “a diagnosis related to her left shoulder” from the Incident;16 (ii) Zayas 

had “complaints of pain and some findings on physical exam[s] documented by Dr. 

Cary;”

17 and (iii) Dr. Cary’s report, dated December 16, 2017, stated that Zayas’s left 

shoulder problem, among other injuries, was one hundred percent related to the Incident. 

Dr. Crain testified that he agreed with Dr. Cary’s conclusion regarding the causal 

connection between Zayas’ left shoulder problem and the Incident.

18

 

On October 1, 2019, Dr. Tadduni was deposed by the parties’ respective attorneys. 

Generally, Dr. Tadduni did not take issue with the “reasonableness and necessity of the 

treatment performed by Dr. Crain or . . . the surgery that he performed.”19 Although Dr. 

Tadduni answered questions about Dr. Ginsberg and Dr. Crain’s medical findings 

regarding Zayas’ injury and treatment, Dr. Tadduni refused to answer questions on crossexamination about Dr. Cary’s medical findings due to Dr. Cary’s pending disciplinary 

charges.

20 Dr. Tadduni “repeatedly testified that he would not accept the validity of or 

acknowledge anything Dr. Cary documented” because Dr. Cary’s medical license was 

suspended on an emergency basis as a result of the pending charges.21

On November 14, 2019, the IAB conducted the Hearing. At the start of it, Zayas’ 

16 A206 (Dr. Crain Dep. at 6).

17 Id.

18 Id.

19 A282 (Dr. Tadduni Dep. at 24).

20 A295–99, A302–08 (Dr. Tadduni Dep. at 37–41, 44–50). See also Appendix A to this opinion.

21 A003 (IAB Decision at 3).
9

counsel presented a motion to exclude Dr. Tadduni’s deposition testimony due to Dr. 

Tadduni’s refusal to answer questions concerning Dr. Cary’s treatment and records.

22

 

Zayas’ counsel argued that the Medical Records directly contradicted Dr. Tadduni’s 

opinion. Further, Dr. Tadduni’s refusal to testify concerning the Medical Records 

significantly prejudiced Zayas by precluding relevant impeachment questions related to his 

opinions.23 For example, Dr. Tadduni had testified on direct examination that: “I think 

what you have to look at is the period after the injury where she’s examined multiple times, 

twice by me, and she’s not sent for an MRI of her shoulder at any point because she doesn’t 

really have symptoms or findings that point to a left shoulder problem.”24 The Board 

denied Zayas’s motion and stated that such conduct would affect the weight of the evidence 

being presented.25

During Zayas’ direct testimony, Zayas’ counsel sought to admit Zayas’ Medical 

Records into evidence.

26

 Counsel for Employer objected and argued that Zayas was not in 

22 A028–32 (IAB Hr’g Tr. at 5–9); see also A333–40 (Zayas’s October 7, 2019 Letter Requesting

to Exclude Dr. Tadduni Testimony.).

23 A032 (IAB Hr’g Tr. at 9). Zayas’s counsel raised a prior instance where Dr. Tadduni behaved 

similarly. In 2018, Dr. Tadduni “refused to answer any questions [in another matter] about medical 

records of [a different doctor] that contradicted statements that Dr. Tadduni was making with 

regard to what was in the record.” A031 (IAB Hr’g Tr. at 8). Zayas’s counsel asserted that there 

is a pattern of inappropriate and unprofessional conduct by a doctor who is not “comp certified,” 

who does not treat patients in Delaware, whose sole involvement in Delaware is doing defense 

medical examinations and testifying before the Board. A032 (IAB Hr’g Tr. at 9). 

24 A274 (Tadduni Dep. at 16) (emphasis added). 

25 A038 (IAB Hr’g Tr. at 38). The Board was “sympathetic” to the objections of the Employer’s 

counsel and instructed Zayas’s counsel to “move on” after reading from Dr. Tadduni’s deposition. 

A149 (IAB Hr’g Tr. at 126). 

26 A061 (IAB Hr’g Tr. at 38). 
10

a position to authenticate the Medical Records and that those records were unreliable due 

to Dr. Cary’s pending disciplinary action. Zayas’s counsel argued that if the Board did not 

admit the Medical Records, Zayas would have no way of getting this evidence in front of 

the Board due to Dr. Tadduni’s prior refusal to answer questions.27 Additionally, Zayas’s 

counsel argued that the emergency suspension of Dr. Cary was inadmissible for any 

consideration by the Board because, according to a Superior Court case, a suspension is 

not a finding.

After a short discussion off the record, “[t]he Board sustained [Employer’s] 

objections to allowing [Zayas] to testify about the content of Dr. Cary’s medical records 

and to admitting Dr. Cary’s medical records into evidence.”28 Further, the Hearing Officer 

stated, with regard to Zayas’s counsel’s argument that there would be no way of getting 

the Medical Records evidence in front of the Board, that Zayas had her “own doctor to be 

able to talk about what was in those records.”29 But the testimony provided by Dr. Crain 

was pre-recorded, as was Dr. Tadduni’s testimony, and Dr. Crain’s deposition preceded 

Dr. Tadduni’s. Dr. Crain was deposed on September 24, 2019.30 Dr. Tadduni was deposed 

27 A063 (IAB Hr’g Tr. at 40). Employer’s counsel responded that Zayas’s counsel could have 

subpoenaed Dr. Cary or could have gone through the records with Dr. Crain. Zayas’s counsel then 

countered that Dr. Crain testified before Dr. Tadduni and that “Dr. Cary will not testify.” A064

(IAB Hr’g Tr. at 41). 

28 A006 (IAB Decision at 6 n.4). 

29 A065 (IAB Hr’g Tr. at 42).

30 A201–58 (Dr. Crain Dep.). Dr. Crain is a board-certified provider under the Workers’ 

Compensation Guidelines who has testified on behalf of both claimants and employers. A204–05 

(Dr. Crain Dep.).
11

on October 1, 2019.31 Zayas argued that she should not be expected to have anticipated 

Dr. Tadduni’s improper deposition conduct. 

On March 20, 2020, the Board issued the IAB Decision.

32

 As a preliminary matter, 

the Board addressed Dr. Tadduni’s conduct during his deposition. Specifically, during his 

deposition, Dr. Tadduni was obstructive and disrespectful to Zayas’s counsel.33 The Board 

noted that this was not the first time Dr. Tadduni had refused to respond to questioning. 

Further, the Board noted that Dr. Tadduni is not licensed to practice medicine in 

Delaware.34 Nor is he a certified provider under the Delaware Workers’ Compensation 

Healthcare Payment System. Rather, according to the IAB Decision, “[h]is only 

31 A259–332 (Dr. Tadduni Dep.). 

32 A001–22 (IAB Decision). 

33 A003–04 (IAB Decision at 3–4). The IAB Decision states that: 

In Dr. Tadduni’s repeated refusals to respond to questioning, he continually 

obstructed deposition proceedings, insulted [Zayas’] counsel, inappropriately 

challenged [Zayas’] counsel’s ethics, wasted much time, and increased the fees 

associated with his deposition. Furthermore, Dr. Tadduni unilaterally made a legal 

decision (a decision to be made by the Board) that such evidence was not relevant, 

credible or admissible.

A004 (IAB Decision at 4) (citations to Dr. Tadduni Dep. omitted). 

34 In his deposition, Dr. Tadduni testified as follows:

Q. Doctor, do you practice in Delaware?

A. No. 

Q. Do you treat any patients in Delaware or have any privileges to perform surgery 

in Delaware?

A. No. 

Q. Your interactions with Delaware, is that solely for the purpose of performing 

defense medical examinations?

A. Correct. 

A313 (Dr. Tadduni Dep. at 55). 
12

involvement in Delaware pertaining to workers’ compensation cases related to profiting 

from performing defense medical examinations and from providing medical expert 

testimony.”35 The Board stated that it was referring Dr. Tadduni to the Division of 

Professional Regulation. It also warned that if he repeated this conduct, “the Board will 

consider referring Dr. Tadduni to the Delaware Attorney General’s office to pursue before 

the Delaware Superior Court a finding of contempt.”36 Separately, citing this Court’s 

decision in In re Shorenstein Hays-Nederlander Theatres LLC Appeals,

37 the Board stated 

that, “Employer’s counsel should have directed Dr. Tadduni to cooperate with crossexamination.”38

 

After addressing Dr. Tadduni’s misconduct, the Board explained that Zayas failed 

to meet her burden of proof that the surgery on her left shoulder was causally related to the 

Incident. The Board specified three reasons underlying its decision: (1) it found Dr. 

Tadduni to be more credible than Dr. Crain because Dr. Crain did not explain how the 

injury could have caused the tears; (2) the video captured Zayas falling onto her right side, 

rather than her left side; and (3) “the evidence [did] not support that [Zayas] presented with 

pain upon rotator cuff testing within close proximity to the assault or in Dr. Cary’s 

records.”39 

35 A005 (IAB Decision at 5). 

36 Id. (citing 19 Del. C. § 2320(6)). 

37 213 A.3d 39, 78 (Del. 2019). 

38 A005 (IAB Decision at 5). 

39 A020 (IAB Decision at 20) (emphasis added). We note that in her briefing on appeal, Zayas 

contends that she also fell on her left side. She states that that part of her fall was captured on the 
13

Zayas timely appealed to the Superior Court. On appeal, Zayas argued that: (1) the 

Board erred in admitting the testimony of Dr. Tadduni and that his refusal to respond to 

questions on cross-examination regarding Dr. Cary’s records rendered his opinion 

unreliable under Delaware Rule of Evidence 702; and (2) the Board erred in excluding 

Zayas’s Medical Records that it later acknowledged were relevant and admissible.40 Zayas 

argued that the substance of these records directly contradicted the basis of Dr. Tadduni’s 

opinion and related to the heart of the issue in controversy. The Superior Court, in 

affirming the IAB Decision, determined that “the Board had sufficient evidence to 

conclude that Zayas had failed to meet her burden of proof that her left shoulder injury was 

causally related to the September 2016 assault,”

41 and that the IAB Decision was “free 

from legal error.”42 

The Superior Court did not address the Board’s decision to exclude the Medical 

Records.43 Nor did it address the Board’s refusal to strike Dr. Tadduni’s testimony.

video also, and that the video did not capture the entire Incident. Opening Br. at 1. See also A158 

(IAB Hr’g Tr. at 135). Her counsel stated that the video depicted her being hit “close to 30 times.” 

A159 (IAB Hr’g Tr. at 136). 

40 A432–33 (Superior Ct. Op. at 20–21).

41 A440–41 (Superior Ct. Op. at 28–29).

42 Id.

43 See, e.g., A411–412 (Notice of Appeal to Delaware Superior Court) (The Notice provides the 

following: “4. The Board erred as a matter of law in permitting the testimony of Employer’s 

expert, Dr. Gregory Tadduni. 5. The board erred as a matter of law in precluding the Claimant 

from admitting her medical records, including records of Dr. Damon Cary, into evidence at the 

hearing.”). The Medical Records are included in Appellant’s Appendix filed with this Court. 

A341–94 (Zayas’ Medical Records from Dr. Cary). However, the Medical Records do not appear 

in the record below based upon our review of that record. 
14

The Superior Court relied largely on the Board’s credibility determinations that 

Zayas was not credible and that Zayas had failed to show that the Board acted unreasonably 

or capriciously in crediting the Employer’s medical expert over Dr. Crain. The Superior 

Court concluded that:

It is solely the Board’s function to weigh the evidence and to make credibility 

determinations. The Board is free to rely on either expert; thus, the Board 

was entitled to accept Dr. Tadduni’s opinion as more persuasive regarding 

the causal relationship between [Zayas’] left shoulder injury and the incident. 

Therefore, the Board did not commit legal error by accepting Dr. Tadduni’s 

opinion over Dr. Crain’s.44 

Thereafter, Zayas timely appealed to this Court. 

II. Standard of Review

“The review of an Industrial Accident Board's decision is limited to an examination 

of the record for errors of law and a determination of whether substantial evidence exists 

to support the Board's findings of fact and conclusions of law.”45 “Substantial evidence is 

‘such relevant evidence as a reasonable mind might accept as adequate to support a 

conclusion.’”46 

“On appeal, this Court will not weigh the evidence, determine questions of 

credibility, or make its own factual findings.”47 “Weighing the evidence, determining the 

credibility of witnesses, and resolving any conflicts in the testimony are functions reserved 

44 A440 (Superior Ct. Op. at 28). 

45 Roos Foods v. Guardado, 152 A.3d 114, 118 (Del. 2016) (citing Stanley v. Kraft Foods, Inc., 

2008 WL 2410212, at *2 (Del. Mar. 24, 2008)).

46 Id. (citing Olney v. Cooch, 425 A.2d 610, 614 (Del. 1981)).

47 Id. (citing Person-Gaines v. Pepco Holdings, Inc., 981 A.2d 1159, 1161 (Del. 2009)).
15

exclusively for the Board.”48 “When determining the reliability of an expert’s opinion, the 

Board must make a determination of the reliability of the sources on which the expert 

relied.”49 Further, “[t]he Board is not required to accept medical evidence that it deems 

unreliable[.]”50 Moreover, where factual determinations are at issue, this Court takes due 

account of the Board’s experience and specialized competence and of the purposes of 

Delaware’s worker’s compensation statute.

51

If the Board decided legal issues, this Court reviews them de novo.

52

 If there is no 

error of law and substantial evidence supports the Board’s findings, “the Board’s decision 

must be affirmed.”53

III. Analysis

In considering the evidentiary issues presented here, we note at the outset that 

“[a]dministrative agencies operate less formally than courts of law.”

54

 For example, how 

the rules of evidence apply to IAB hearings is set forth under Section 1331 of the Industrial 

48 Powell v. OTAC, Inc., 223 A.3d 864, 870 (Del. 2019) (citing Noel-Liszkiewicz v La-Z-Boy, 68 

A.3d 188, 191 (Del. 2013)).

49 Adams v. F. Schumacher & Co., Inc., 886 A.2d 1277, 2005 WL 2895105, at *2 (Del. Nov. 1, 

2005) (TABLE) (citing Fensterer v. State, 509 A.2d 1106, 1110 (Del. 1986)). 

50 White v. Volt Services, 35 A.3d 420, 2011 WL 6826438, at *1 (Del. Dec. 22, 2011) (TABLE). 

51Spellman v. Christiana Care Health Servs., 74 A.3d 619, 623 (Del. 2013). 

52 Oceanport Indus., Inc. v. Wilm. Stevedores, Inc., 636 A.2d 892, 899 (Del. 1994) (internal 

quotation marks omitted). 

53 Stevens v. State, 802 A.2d 939, 944 (Del. Super. 2002) (citing Breeding v. Contractors-OneInc., 549 A.2d 1102, 1104 (Del. 1988)). 

54 Standard Distrib. Co. v. Nally, 630 A.2d 640, 647 (Del. 1993).
16

Accident Board Regulations (the “Regulations”). Specifically, Section 1331.14.3 of the 

Regulations provides:

The rules of evidence applicable to the Superior Court of the State of 

Delaware shall be followed insofar as practicable; however, that evidence 

will be considered by the Board which, in its opinion, possesses any 

probative value commonly accepted by reasonably prudent persons in the 

conduct of their affairs. The Board may, in its discretion, disregard any 

customary rules of evidence and legal procedures so long as such a 

disregard does not amount to an abuse of its discretion.

55

An abuse of discretion occurs when the Board’s decision has “exceeded the bounds of 

reason in view of the circumstances, [or] so ignored recognized rules of law or practice as 

to produce injustice.”56

Further, Section 1331.10.6 of the Regulations sets forth the scope of administrative 

depositions, which provides that “[t]he deponent may be examined regarding any matter, 

55 19 Del. Admin. C. § 1331-14.3. See Standard Distributing, Inc. v. Hall, 897 A.2d 155, 157 

(Del. 2006) (noting that “[w]hile the Board operates ‘less formally than courts of law,’ and ‘the 

rules of evidence do not strictly apply,’ it is nonetheless an adversarial proceeding where the rules 

of evidence apply insofar as practicable.”) (citing Standard Distributing Co. v. Nally, 630 A.2d 

640, 647 (Del. 1993)). See also Paulley v. Second String, LLC d/b/a Hammerheads Dockside, No. 

1478726 (I.A.B. Oct. 9, 2019) (“[T]he Board will only consider evidence which in its opinion, 

possesses any probative value commonly accepted by reasonably prudent persons in the conduct 

of their affairs.”). See also Carey v. Bryan and Rollins, 105 A.2d 201, 203–05 (Del. Super. 1954) 

(holding that, where a question regarding claimant’s intoxication during the time of the accident 

was material, it was an error for Unemployment Industrial Accident Board (“UIAB”) to permit the 

claimant to refuse to answer the question). The Superior Court further held, if the claimant 

continued to refuse answering material questions regarding the issue of intoxication, that the UIAB 

may strike all of the claimant’s testimony regarding the accident. Id. 

56 Roos Foods, 152 A.3d at 118 (alteration in original) (quoting Lilly v. State, 649 A.2d 1055, 1059 

(Del. 1994)); see e.g., Abrahams v. Chrysler Grp., LLC., 44 A.3d 921, 2012 WL 1744270 (Del. 

May 11, 2012) (TABLE). In Abrahams, the Court ruled that the “IAB improperly permitted 

Chrysler’s attorney to offer what amounted to expert testimony during her closing argument. This 

maneuver, defended before this Court as a tactical decision, violated fundamental notions of 

fairness by depriving Abrahams of the opportunity to dispute the facts material to the outcome of 

his case.” Id. As a result, the Court determined that this case represented an abuse of discretion. 

Id.
17

not privileged, which is relevant to the subject matter involved in the pending action.”57 In 

refusing to strike Dr. Tadduni’s testimony, the Board reasoned that Dr. Tadduni’s 

testimony should be admitted because: (1) the Employer would have no medical expert to 

testify on its behalf; (2) Zayas had the opportunity to elicit the information contained in 

Dr. Cary’s records during the deposition of Dr. Crain; and (3) the prejudice to the Employer 

outweighed the prejudice to Zayas by allowing the testimony. The Board attempted to 

ameliorate any such prejudice by stating it would factor Dr. Tadduni’s refusal to cooperate 

into its deliberations when weighing the evidence. 

But we hold that it was improper for Dr. Tadduni to unilaterally determine that he 

did not have to testify about the Medical Records. Dr. Tadduni’s refusal to answer relevant 

questions, and the Employer’s counsel’s failure to address this conduct, deprived Zayas of 

the opportunity to elicit relevant information material to the outcome of her case, and to 

effectively cross-examine Dr. Tadduni about his medical opinion.58 Accordingly, the 

Board abused its discretion by admitting Dr. Tadduni’s testimony. Furthermore, the 

Board’s exclusion of the Medical Records, which it stated constituted relevant and 

“admissible evidence,” also reflects an internal inconsistency and illogical process.

59

 

57 19 Del. Admin. C. § 1331-10.6.

58 Appendix A (attached hereto) contains illustrative excerpts of Dr. Tadduni’s deposition.

59 We also acknowledge Zayas’s explanation that she did not attempt to elicit such information 

during Dr. Crain’s deposition because Dr. Crain had appeared via an earlier pre-recorded 

deposition and Zayas had not anticipated that Dr. Tadduni would improperly refuse to answer 

questions about Dr. Cary’s treatment of Zayas.
18

Moreover, given the Board’s statement that the Medical Records were relevant and 

admissible, and given Dr. Tadduni’s testimony that he would not acknowledge anything 

Dr. Cary documented, Zayas’s argument that Dr. Tadduni’s testimony lacked a factual 

foundation and was based on an incomplete medical history has significant force. As we 

explained in Perry v. Berkley, “[t]his Court has adopted the United States Supreme Court 

holding in Daubert, which requires that an expert’s opinion be based upon a proper factual 

foundation and sound methodology to be admissible.”60 Pursuant to that rule, any expert 

who testifies must satisfy Delaware Rule of Evidence (“D.R.E.”) 702 in order for his or 

her testimony to be admissible as evidence. If an expert’s opinion lacks a factual 

foundation, then the opinion is not valid.61 

In Perry, this Court affirmed the decision of the trial court’s exclusion of the 

testimony of plaintiff’s medical expert and its dismissal of the case due to lack of evidence 

of causation. The plaintiff in Perry alleged that she sustained back injuries as the result of 

a motor vehicle accident. Plaintiff’s only medical expert opined that the accident caused 

plaintiff’s back injury because she had not experienced any back pain prior to the accident. 

However, plaintiff’s expert had not personally treated her after the accident and based his 

opinion on medical records and the plaintiff’s self-reports. Although Perry’s counsel had 

advised plaintiff’s expert that the plaintiff had been treated for back pain prior to the 

accident in question, the expert “apparently did not read those communications . . . because 

60 Perry v. Berkley, 996 A.2d 1262, 1267 (Del. 2010) (emphasis added).

61 Id. at 1265.
19

at his 2009 deposition [the expert] testified that he had no knowledge of Perry’s preexisting back condition and prior treatments for pain.”62

 Because the expert’s opinion was 

premised on the incorrect assumption that the plaintiff had not previously experienced back 

pain, the trial judge excluded the expert’s testimony on the grounds that it lacked the proper 

factual foundation.63 

Zayas compares Dr. Tadduni’s lack of a factual foundation to that of the medical 

expert’s in Perry. Zayas argues that Dr. Tadduni opined that she failed to “demonstrate 

left shoulder symptoms for nearly two years before she was referred to Dr. Crain,”

64 but 

that Dr. Cary’s records confirm that Zayas had continued complaints of left shoulder 

symptoms during that period. 

62 996 A.2d at 1266. 

63 Specifically, the trial judge expressed concern about the factual basis for the medical expert’s 

opinion, stating that:

[Y]our doctor, [] predicates his opinion as to causation on the lack of any 

complaints by your client [] as to her low back prior to the accident, . . . and that 

the trauma was causally related to the herniation . . . how can that opinion be valid 

when [the expert] didn’t know—when you[r] client didn’t tell him about the 

previous low-back complaints and it was never disclosed to him that she had been 

diagnosed with herniation before the accident.

Id. at 1266. The Superior Court continued to express its concern by stating that “it’s really a 

Daubert problem. This motion, as I see it, doesn’t focus on qualifications or competence or 

methodology or science involved, it focuses on factual foundation. And if the factual foundation 

isn’t there, the opinion is not valid.” Id.

64 Opening Br. at 27. Dr. Tadduni testified that Zayas did not have any left shoulder symptoms 

for two years following the Incident. A274 (Dr. Tadduni Dep. at 16). Zayas argues that his 

testimony disregards her forty-three visits to Dr. Cary which the Employer paid for where she 

specifically complained of left shoulder problems. See also Durmmond Fuel Oil v. O’Neal, 734

A.2d 1060, 1065 (Del. 1999) (stating that treating physicians have great familiarity with a patient’s 

condition and their opinions should be given substantial weight).
20

Employer contends that Zayas misapplies Perry because in Perry, the medical 

expert “rendered an expert opinion based on a completely incorrect case specific factual 

predicate.”65 Employer attempts to distinguish this case from the Perry case by arguing 

that Dr. Tadduni “had knowledge of the facts of the case, and the injuries sustained by 

[Zayas]” and that Dr. Tadduni “based his opinion that [Zayas’] surgery was not casually 

related to the [I]ncident on the fact that he found no left shoulder complaints until [Zayas] 

saw Dr. Ginsburg in August of 2018, almost two years after the [I]ncident.”66

But according to the testimony of Dr. Crain and Zayas, Dr. Tadduni’s factual 

foundation contradicts the Medical Records that documented Zayas’ complaints of left 

shoulder injury. The Board said the Medical Records were “relevant” and “admissible” 

but excluded them. According to Zayas, given Dr. Tadduni’s refusal to respond to 

questions during cross examination, it was unclear whether Dr. Tadduni had even reviewed 

the Medical Records prior to arriving at his opinion.67

This situation resembles the situation in Perry. Dr. Tadduni predicated his opinion, 

at least in part, on the lack of any complaints by Zayas as to her left shoulder. However, 

Zayas’ Medical Records documented numerous complaints regarding her left shoulder. 

Notwithstanding the professional issues in which Dr. Cary was involved, Dr. Tadduni’s 

65 Answering Br. at 20 (quoting Perry, 996 A.2d at 1271).

66 Id. (citing A288 (Dr. Tadduni Dep. at 30)).

67 See Opening Br. at 27–28 (“Dr. Tadduni’s outright refusal to answer any questions regarding 

those records let the Board, and the Superior Court, unable to conclude whether those records 

[from Dr. Cary] were even considered in [Dr. Tadduni’s] opinion at all. In fact, at one point, [Dr. 

Tadduni] indicated the records may have never been provided to him.”).
21

refusal to acknowledge, consider and to respond to cross-examination as to critical facts 

that go to the heart of the factual basis for his opinion, lead us to conclude that his opinion 

was based upon an incomplete factual predicate. The Board’s process violated

fundamental notions of fairness, and it therefore, abused its discretion. Accordingly, we 

hold that the Board should have stricken Dr. Tadduni’s testimony. The Board’s errors were

not harmless as the dueling experts were central to Zayas’s case.68 

Finally, the Employer’s counsel should not have tolerated Dr. Tadduni’s deposition 

misconduct. We made clear in Shorenstein that such deposition misconduct is not 

acceptable Delaware practice. As we said there, that “[d]epositions are court proceedings, 

and counsel defending the deposition have an obligation to prevent their deponent from 

impeding or frustrating a fair examination.”69 We also said that, “[l]awyers have an 

obligation to ensure that their clients do not undermine the integrity of the deposition 

proceedings by engaging in bad faith litigation tactics; they cannot simply sit and passively 

observe as their client persists in such conduct.”70 In any proceedings on remand, Dr. 

Tadduni’s deposition taken in this case shall not be admitted for any purpose. 

68 See, e.g., Abrahams v. Chrysler Group LLC, 44 A.3d 921, 2012 WL 1744270, at *4 (reversing 

and stating that, “[t]his case, at its heart, was about dueling experts, and an attempted impeachment 

of an expert without notice and an opportunity for the parties offering the expert to respond might 

well have determined the outcome.”). As Zayas’s counsel aptly noted at the close of the Hearing, 

Dr. Tadduni’s credibility was at issue -- “[t]he credibility of the person who while he profits from 

our workers’ compensation system, fails to fairly participate in it and engage in discussion through 

way of deposition.” (IAB Hr’g Tr. at 159). 

69 213 A.3d at 78. 

70 Id. at 79. 
22

IV. Conclusion

For the reasons set forth above, we REVERSE the Superior Court’s order, and 

REMAND for proceedings consistent with this opinion. 
23

Appendix A

The following are selected excerpts from Dr. Tadduni’s deposition: 

[Mr. Fredericks]: You reviewed the medical records of Dr. Cary; correct?71

[Dr. Tadduni]: I’m not even gonna talk about medical records of Dr. Cary. 

That would have absolutely no relevance to me at all and I think you know 

why. 

[Mr. Fredericks]: Doctor, I’m gonna just ask you to answer my questions. 

[Dr. Tadduni]: I’m gonna tell you that anything in the medical records of Dr. 

Cary would have absolutely no relevance to me –

[Mr. Fredericks]: Okay.

[Dr. Tadduni]: -- and you know why. 

[Mr. Fredericks]: Okay. And, again, just do me a favor and just answer the 

questions unless Mr. Klusman --

[Dr. Tadduni]: I answered the question. Nothing in Dr. Cary’s records would 

have any relevance to me, so even if I mention them in my report, that would 

have been by mistake --

[Mr. Fredericks]: Okay.

[Dr. Tadduni]: -- in retrospect.

[Mr. Fredericks]: I’m just trying to understand what you reviewed. Did you 

review --

[Dr. Tadduni]: No, that’s not what you’re trying to do. I’m not going to tell 

you what Dr. Cary said because it’s obviously not relevant to any of us. It’s 

not relevant to you. It’s not relevant to the Board. It’s not relevant to Mr. 

Klusman. 

71 Mr. Fredericks is Zayas’s counsel. The telephone deposition was taken on October 1, 2019. 

(A259–A332). 
24

[Mr. Fredericks]: I understand that it may not be relevant to the Employer 

or to you. I understand that. It is relevant to me as --

[Dr. Tadduni]: Well, it shouldn’t be. It shouldn’t be and you know it 

shouldn’t be.

[Mr. Fredericks]: Doctor --

[Dr. Tadduni]: You know it shouldn’t be. 

[Mr. Fredericks]: Doctor, I’m trying to be incredibly polite and respectful. 

[Dr. Tadduni]: And I’m being polite too. I’m being polite too. You’re 

bringing up something that is absurd. 

[Mr. Fredericks]: Doctor, can you tell me whether you reviewed the 

treatment records of Dr. Cary.

[Dr. Tadduni]: I’m not even discussing Dr. Cary.

[Mr. Fredericks]: All right. 

[Mr. Fredericks]: Mr. Klusman, if the Doctor refuses to answer questions, 

and if you think my question is inappropriate, certainly let me know, but if 

the Doctor refuses to answer questions from me that are reasonable and 

relevant, I’m gonna have to strike his testimony. I don’t want to have to do 

that. 

[Mr. Klusman]: Well, Joel, you’ll do whatever you think is appropriate. You 

have the opportunity to ask him whatever you want and he’s got the 

opportunity to answer in the way he sees fit. 

We all know that Dr. Cary’s been suspended for fraudulently preparing 

medical records which document diagnoses that are not accurate, not offered 

by the patient, complaints that were not offered by the patient and then 

submitting those records to insurance for payment based on those fraudulent 

records, so that’s I think the basis of Dr. Tadduni’s opinions. I can’t help 

you any more than that. 

[Mr. Fredericks]: But he also hasn’t been found guilty of any of those things. 

It’s a complaint and it’s still pending and he’s entitled to a hearing at this 

point and, again, these are treating doctor’s records, treating doctor’s records 

that are in his own report. Perhaps if you let him know that this information 
25

is relevant and admissible, maybe that would change some of his testimony. 

I’m just trying to think of the path of least resistance, Mr. Klusman. I’m 

trying to get through this as expeditiously as possible. 

[Mr. Klusman]: I guess, Joel -- I can’t tell – I’m not gonna tell the Doctor to 

answer questions that he doesn’t feel comfortable answering. 

[Dr. Tadduni]: You’re asking me to perpetrate a fraud on the Board? Is that 

what it is?

[Mr. Fredericks]: Doctor, I’m asking you to answer clear and relevant 

questions. 

[Dr. Tadduni]: No. You’re asking me to perpetrate a fraud on the Board. 

His license was emergently revoked. Emergently revoked; okay? And 

you’re gonna ask me to talk about what Dr. Cary found?

[Mr. Klusman]: Joel, you’re gonna have to move on. Doctor clearly is not 

comfortable answering these questions relying on Dr. Cary’s records.72

. . .

[Mr. Fredericks]: So let me be clear. Is there anything specifically that says 

left shoulder in any of those records?

[Dr. Tadduni]: No.

[Mr. Fredericks]: Is there any diagnosis as to the left shoulder in any of those 

records?

[Dr. Tadduni]: No, and that’s consistent with the fact that when I see her in 

2016 she also doesn’t complain specifically about the shoulder. She has 

complaints everywhere and her exam is negative with regard to the shoulder, 

so that would be consistent with that. 

[Mr. Fredericks]: All right. But when she goes to see Dr. Cary after the 

assault the first visit on September 15, 2018 she’s complaining of left 

shoulder complaints specifically and she’s diagnosed with a left shoulder 

condition; correct?

72 A295–298 (Tadduni Deposition at 37–40).
26

[Dr. Tadduni]: How could we possibly know that? It’s Dr. Cary. We can’t 

possibly know what she actually complained of on that day.73

. . .

[Mr. Fredericks]: On the physical examination it shows tenderness and 

restricted range of motion as to the left shoulder. Do you agree? 

[Dr. Tadduni]: Again, I’m not – I am not gonna substantiate the physical 

exam of somebody whose license has been emergently revoked. I’m not 

doing that.

[Mr. Fredericks]: Doctor, all you have to say is I’m not answering and I can 

move on. You just have to say I’m not answering and I can move on.

[Dr. Tadduni]: So why do you keep pressing this? I would think that you’d 

be embarrassed to ask that question. You should be embarrassed to ask that 

question.

[Mr. Fredericks]: Doctor, I can appreciate your opinion but I have a job that 

I have to do.

[Dr. Tadduni]: Right. And it doesn’t matter how you do it. Throw whatever 

you want on the wall and maybe some of it’ll stick.74

. . .

[Mr. Fredericks]: All right. I want to jump back to the questions again. If 

you’re not gonna answer it, just say you’re not gonna answer. I’m actually 

going to instead go through them individually just lump them all together --

okay? – for the purposes of time. I took a look at Dr. Cary's records after this 

injury, this assault, included evaluations and therapy, and there was a 

reference to a shoulder problem in almost all the records, and I pulled out a 

few dates. I'm just gonna go through them: September 20th, 2016; October 

6th, 2016; October 18th, 2016; October 25th, 2016; December 8th; 2016; 

January 5th, 2017; February 7th, 2017; March 16th, 2017; April 18th, 2017; 

May 23rd, 2017; July 6th, 2017; and August 17, 2017. I stopped at about a 

year. Do you have any reason to dispute that there are references to problems 

with the left shoulder in those records?

73 A301–302 (Tadduni Deposition at 43–44). 

74 A303 (Tadduni Deposition at 45).
27

[Dr. Tadduni]: I'm not gonna substantiate records of Dr. Cary, so you can 

testify if you're allowed to testify, but I'm not gonna testify to that. I'm also 

looking at Dr. Gelman's report. It seems like the diagnoses he makes do not 

mention the left shoulder. Cervical spine. Lumbosacral spine. I don't see 

that he makes a left shoulder diagnosis.75

. . .

[Mr. Fredericks]: So if you were in that position of a pain management 

doctor, not an orthopedic surgeon, not a specialist, when that problem is 

going on for a year, wouldn't it be reasonable at that point to send a person 

to a specialist or for an MRI?

[Dr. Tadduni]: It would be, yes. 

[Mr. Fredericks]: Dr. Cary didn’t do that though; right?

[Dr. Tadduni]: You really just want to prolong this unnecessarily. 

[Mr. Fredericks]: Well, not really. But Dr. Cary didn’t do that; right?

[Dr. Tadduni]: I told you I’m not gonna testify to what Dr. Cary did or said 

or didn’t do.76

. . .

[Mr. Fredericks]: Again, I'm gonna keep going with Dr. Cary. We stopped 

in August 2017. She continued to treat with Dr. Cary up until the time he 

referred her to Dr. Ginsberg in August of 2018 with continued consistent 

references to the left shoulder. Do you have any reason to dispute that?

[Dr. Tadduni]: Yes, I have reason to dispute it.

[Mr. Fredericks]: Do you have any reason to dispute that that is what is noted 

in the records, Doctor?

75 A305–306 (Tadduni Deposition at 47–48).

76 A307 (Tadduni Deposition at 49).
28

[Dr. Tadduni]: I'm not gonna testify to his records. I told you that. If you 

can testify, then testify. Why don't you bring him in, let him testify.77

. . .

[Mr. Fredericks]: This opinion that you hold of Dr. Cary, is it an opinion that 

you formed before any issues with his medical license? Is this an opinion that 

you've held before then or since then?

[Dr. Tadduni]: I’d say it’s a combination. 

[Mr. Fredericks]: Okay. He's not a doctor that you're particularly fond of; is 

that fair?

[Dr. Tadduni]: I'm sure he's a doctor you're particularly fond of.78

77 A308 (Tadduni Deposition at 50).

78 A317–318 (Tadduni Deposition at 59–60).