[PUBLISH]

IN THE UNITED STATES COURT OF APPEALS

FOR THE ELEVENTH CIRCUIT

________________________

No. 19-13276

________________________

D.C. Docket No. 0:18-cv-61047-UU

UNITED STATES OF AMERICA, 

 Plaintiff - Appellee,

versus

US STEM CELL CLINIC, LLC, 

a Florida limited liability company, 

US STEM CELL, INC., 

a Florida profit corporation, 

KRISTIN C. COMELLA, 

individually, 

 Defendants - Appellants.

________________________

Appeal from the United States District Court

for the Southern District of Florida

________________________

(June 2, 2021)

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Before JORDAN, MARCUS, and GINSBURG,* Circuit Judges.

GINSBURG, Circuit Judge: 

US Stem Cell Clinic, LLC, its parent company, and its chief scientific 

officer (collectively, the Clinic) offer a procedure in which they remove fat tissue 

from a patient, isolate the portion containing stem cells, and inject that portion

back into the patient. This procedure purportedly treats all manner of chronic 

conditions, from pain to Parkinson’s disease. 

The United States Food and Drug Administration is skeptical of the Clinic’s 

claims. It sued the Clinic, alleging the stem cell procedure violates the Federal 

Food, Drug, and Cosmetics Act (codified at 21 U.S.C. §§ 301 et seq.). The district 

court granted summary judgment for the FDA and enjoined the Clinic from 

offering its procedure until it can demonstrate to the FDA that its stem cell therapy 

is safe and effective. The Clinic appeals, arguing it is exempt from regulation 

because the procedure falls into either the “same surgical procedure” exception or 

the “361 HCT/P” exception to regulation under the FDCA. See 21 C.F.R. 

§ 1271.15(b); id. § 1271.10. We disagree: The procedure does not fall within the 

first exception because the biological material implanted into the patient is not the 

same as that removed and the procedure does not fall within the second exception 

* Honorable Douglas H. Ginsburg, United States Court of Appeals for the District of Columbia 

Circuit, sitting by designation.

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because the Clinic intends the stem cells to perform functions after the procedure 

beyond the basic functions the stem cells performed prior to the procedure. We 

therefore affirm the judgment of the district court. 

I. Background

Since 2001 the FDA has regulated human cells, tissues, and cellular and 

tissue-based products or “HCT/Ps,” which the FDA defines as “articles containing 

or consisting of human cells or tissues that are intended for implantation, 

transplantation, infusion, or transfer into a human recipient,” 21 C.F.R. 

§ 1271.3(d), under both the FDCA and the Public Health Service Act (codified at 

42 U.S.C. §§ 201 et seq.). See Human Cells, Tissues, and Cellular and TissueBased Products, Establishment Registration and Listing, 66 Fed. Reg. 5447, 5447-

69 (Jan. 19, 2001) (codified at 21 C.F.R. § 1271) [hereinafter Final Rule]. The 

FDA has three goals in regulating HCT/Ps: 

1) preventing unwitting use of contaminated tissues with the potential 

for transmitting infectious diseases such as AIDS and hepatitis; 2) 

preventing improper handling or processing that might contaminate or 

damage tissues; [and] 3) ensuring that clinical safety and effectiveness 

is demonstrated for tissues that are highly processed, are used for other 

than their normal function, are combined with non-tissue components, 

or are used for metabolic purposes.

Food & Drug Admin., Proposed Approach to Regulation of Cellular and Tissuebased Products 6 (Feb. 28, 1997), https://www.fda.gov/media/70704/download

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[hereinafter Proposed Approach]. Recognizing “different HCT/Ps may present 

different concerns,” the FDA adopted a “tiered, risk-based approach” to regulating 

them. Final Rule, 66 Fed. Reg. at 5450. The two provisions at issue here are 

aspects of this tiered approach.

The first is the “same surgical procedure” exception, which applies where 

an establishment “removes HCT/Ps from an individual and implants such HCT/Ps

into the same individual during the same surgical procedure.” 21 C.F.R. 

§ 1271.15(b). HCT/Ps in this category are not regulated by the FDA at all – under 

neither the FDCA nor the PHSA – because “[t]he communicable disease risks, as 

well as safety and effectiveness risks, would generally be no different from those 

typically associated with surgery.” Proposed Approach at 12. 

The second provision is 21 C.F.R. § 1271.10, which subjects HCT/Ps

meeting each of several criteria to a lighter regulatory burden. HCT/Ps meeting 

the specified criteria are called “361 HCT/Ps,” and they are regulated under § 361 

of the PHSA (codified at 42 U.S.C. § 264) only to prevent the spread of infectious 

disease. An HCT/P that fails to satisfy one or more criteria may be regulated as a 

biological product under the PHSA or as a drug or device under the FDCA. 21 

C.F.R. § 1271.20. The only criterion at issue here is that the HCT/P must be 

“intended for homologous use only.” 21 C.F.R. § 1271.10(a)(2). “Homologous 

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use” is “the repair, reconstruction, replacement, or supplementation of a recipient’s 

cells or tissues with an HCT/P that performs the same basic function or functions 

in the recipient as in the donor.” Id. § 1271.3(c). Grafting skin from an arm to 

replace lost skin on a face would be a homologous use, for example, but “use of 

amniotic membrane in the eye” would not be. Final Rule, 66 Fed. Reg. at 5458; 

see also Proposed Rule on Establishment Registration and Listing for 

Manufacturers of Human Cellular and Tissue-Based Products, 63 Fed. Reg. 26744, 

26749 (May 14, 1998). In essence, the party offering the procedure must intend 

that the HCT/P do the same basic job before and after it is transplanted. To divine 

the company’s intent, the FDA looks to “the labeling, advertising, or other 

indications of the manufacturer’s objective intent.” 21 C.F.R. § 1271.10(a)(2). 

* * *

The Clinic marketed its body-fat-derived stem cell therapy for the treatment 

of a plethora of autoimmune, neurological, and degenerative conditions, including 

ALS, Parkinson’s disease, kidney disease, brain and spinal cord injuries, COPD,

diabetes, rheumatoid arthritis, osteoarthritis, stroke, liver disease, congestive heart 

failure, and others. 

At the first step of the therapy, the Clinic uses a syringe to remove two 

ounces of the patient’s adipose tissue (that is, body fat). The adipose tissue is 

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made up primarily of fat cells and a network of collagen fibers, but it also contains 

various stromal and vascular cells. These stromal and vascular cells are known 

collectively as the “stromal-vascular fraction” of the adipose tissue; among them 

are the titular stem cells. 

After removing adipose tissue from the patient, the Clinic uses a five-step

process to isolate the stromal-vascular fraction (i.e., to turn the syringe of body fat 

in picture (b) into the tube of stromal and vascular cells in picture (c)). First, the 

adipose tissue is rinsed with a cell wash solution to remove blood cells. Second, 

the Clinic uses an enzyme to digest the collagen fibers. Third, the solution is 

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centrifuged to separate the stromal-vascular fraction from the fat cells. Fourth, the 

Clinic uses a cell extractor and cell strainer to strip away everything except the 

stromal-vascular fraction. Finally, the stromal-vascular fraction is centrifuged a 

second time. The isolated stromal-vascular fraction is then suspended in saline 

solution or in platelet-rich plasma and injected back into the patient. 

The FDA inspected the Clinic in 2015 and 2017. The inspectors found fault 

with several of the Clinic’s practices, including its failure to keep a sterile 

environment and to prevent contamination; test stromal-vascular fraction samples 

for contamination; and label the stromal-vascular fraction solution as a drug. The 

Clinic responded to the FDA’s adverse findings by asserting it was exempt from 

regulation. 

* * *

In 2018 the FDA sued the Clinic, alleging the stromal-vascular fraction 

solution is an adulterated and misbranded drug. While the lay person may not 

think of stem cells as a “drug,” the FDCA’s definition of that word is expansive; 

any “article[] intended for use in the diagnosis, cure, mitigation, treatment, or 

prevention of disease” is a drug for purposes of the statute. 21 U.S.C. 

§ 321(g)(1)(B). In keeping with its “core objective[]” of ensuring drugs sold in the 

United States are safe and effective, FDA v. Brown & Williamson Tobacco Corp., 

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529 U.S. 120, 133 (2000) (citing 21 U.S.C. § 393(b)(2)), the FDCA forbids the 

adulteration or misbranding of drugs, see 21 U.S.C. § 331(k). The FDA alleged 

the Clinic’s solution was “adulterated” because it was not manufactured, 

processed, or stored in conformity with its regulation establishing “good 

manufacturing practice.” 21 U.S.C. § 351(a)(2)(B); see 21 C.F.R. §§ 210-11. It 

further alleged the solution was “misbranded” because it did not bear a label 

providing “adequate directions for use.” 21 U.S.C. § 352(f)(1); see 21 C.F.R. 

§ 201.5. In fact, the FDA argued, the Clinic could not label the stromal-vascular 

fraction solution in compliance with the FDCA because “there is no scientifically 

valid evidence to show that it is safe or effective for any indication.” 

The Clinic did not claim to have complied with the FDA’s good 

manufacturing practice or labeling requirements. Instead, opposing the FDA’s 

motion for summary judgment, the Clinic argued either the same surgical 

procedure or the 361 HCT/P exception applied. The district court rejected those 

arguments and granted the FDA’s motion. United States v. US Stem Cell Clinic, 

LLC, 403 F. Supp. 3d 1279, 1287-98 (S.D. Fla. 2019). 

Regarding the same surgical procedure exception, the district court first held 

the HCT/Ps implanted into the patient must be the same HCT/Ps, in their original 

form, as the ones removed from the patient. Id. at 1288-89. The court based this 

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holding on the text of the regulation, which exempts only an establishment that 

removes HCT/Ps from a patient and reimplants “such HCT/Ps” into the same 

patient. Id. The Clinic had argued the stromal-vascular fraction was an HCT/P 

removed from the patient and reimplanted in its original form, so the procedure 

was exempt. According to the FDA, however, the HCT/P removed was adipose 

tissue and the stromal-vascular fraction solution was obtained only after substantial 

processing; therefore, the Clinic was not exempt. See Food & Drug Admin., Same 

Surgical Procedure Exception Under 21 CFR 1271.15(b): Questions & Answers 

Regarding the Scope of the Exception: Guidance for Industry (Nov. 2017), 

https://www.fda.gov/media/89920/download [hereinafter Guidance Document]

(announcing the FDA’s view of how this exception applies in regard to adipose 

stem cell therapies). The district court deferred to the FDA’s interpretation of its 

regulation and held the same surgical procedure exception did not apply. 403 

F. Supp. 3d at 1289-94. 

Next, the court held the 361 HCT/P exception inapplicable because the 

stromal-vascular fraction solution was not intended solely for homologous use. Id.

at 1297-98. The Clinic had protested that it “intend[ed] the [stromal-vascular 

fraction] to perform the same basic regenerative function before and after the 

procedure.” Id. at 1298. Looking to the Clinic’s marketing materials, however, 

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the district court found the Clinic intended that the stromal-vascular fraction treat a 

“litany of illnesses in the recipient,” which is not the “same basic function” the 

stromal-vascular fraction performed before the procedure. Id. 

The district court went on to hold the Clinic violated the FDCA based upon

the FDA’s undisputed contentions that the stromal-vascular fraction solution was a 

drug, that it was adulterated, and that it was misbranded. Id. at 1298-1300. In a 

separate order, the district court permanently enjoined the Clinic from offering its 

adipose stem cell therapy unless and until several conditions were met, including 

FDA approval of a new drug application or biologics license application for the 

stromal-vascular fraction solution. 

II. Analysis

On appeal, the Clinic again argues it is exempt from regulation under the 

FDCA because either the same surgical procedure exception or 361 HCT/Ps

exception applies. 

A. Same surgical procedure exception

Recall the applicable regulation provides: “You are not required to comply 

[with the FDA’s rules regarding HCT/Ps] if you are an establishment that removes 

HCT/Ps from an individual and implants such HCT/Ps into the same individual 

during the same surgical procedure.” 21 C.F.R. § 1271.15(b). The Clinic’s view is 

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straightforward: The stromal-vascular fraction is removed from the patient and 

then reinjected; therefore, the Clinic removes HCT/Ps from the patient and then 

implants “such HCT/Ps” into the same patient; therefore, the Clinic is exempt from 

regulation under the same surgical procedure exception. The FDA counters that, 

due to the substantial processing necessary to isolate the stromal-vascular fraction, 

the solution injected into the patient does not contain the same HCT/P as was

removed, and therefore is not “such HCT/P[]” as that term is used in the 

regulation. That is, the HCT/P removed was adipose tissue, whereas the HCT/P 

implanted is the stromal-vascular fraction, so the exception does not apply. 

At first glance, both readings seem plausible. There was a time when a court 

faced with a regulation that seemed “impenetrable on first read” might simply 

“wave the ambiguity flag” and defer to the agency’s interpretation. Kisor v. 

Wilkie, 139 S. Ct. 2400, 2415 (2019). No longer. The Supreme Court recently 

clarified that judicial deference is appropriate only if a regulation is “genuinely 

ambiguous.” Id. Before declaring a regulation genuinely ambiguous, we must 

“exhaust all the traditional tools of construction,” which entails “carefully 

consider[ing] the text, structure, history, and purpose of [the] regulation.” Id. 

(internal quotation marks omitted). We will consider the parties’ textual 

arguments, giving the agency’s view no special weight “except to the extent it has 

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the ‘power to persuade.’” Id. at 2414 (quoting Skidmore v. Swift & Co., 323 U.S. 

134, 140 (1944) (“The weight of [an agency’s interpretation] will depend upon the 

thoroughness evident in its consideration, the validity of its reasoning, [and] its 

consistency with earlier and later pronouncements”)). In this case, our tools of 

construction resolve the apparent ambiguity in the FDA’s favor, so we need not 

decide whether to defer to the interpretation expressed in the Guidance Document.

Each side argues its interpretation is textually required. The Clinic first

argues the relevant HCT/P must be the stromal-vascular fraction because adipose 

tissue does not fall within the definition of an HCT/P. Specifically, the Clinic says 

cells or tissues can be HCT/Ps only if they are “intended for implantation” into a 

patient. Appellants’ Br. 13 (quoting 21 C.F.R. § 1271.3(d)). This is not correct. 

HCT/Ps are “articles containing or consisting of human cells or tissues that are 

intended for implantation” into a patient. 21 C.F.R. § 1271.3(d) (emphasis added). 

The adipose tissue contains the stromal-vascular fraction, which consists of cells

intended for implantation into a patient. Therefore, both adipose tissue and 

stromal-vascular fraction are HCT/Ps. 

The Clinic next draws our attention to the opinion of a district court in 

California that, in a similar suit against a clinic offering a similar procedure,

rejected the FDA’s interpretation under the canon against surplusage – the idea that 

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a reading of a statute or regulation which gives each word independent meaning is 

generally to be preferred over a reading that makes some words superfluous. 

United States v. Cal. Stem Cell Treatment Ctr., Inc., No. 5:18-cv-01005, 2020 WL 

1289543 (C.D. Cal. Jan 27, 2020); see also Rimini Street, Inc. v. Oracle USA, Inc., 

139 S. Ct. 873, 881 (2019) (explaining the canon against surplusage and its 

limitations). That court reasoned that through its use of the word “HCT/Ps,” 

§ 1271.15(b) refers to the removal and reimplantation of both cells and tissues: 

“Because cells make up tissues and organs, cells can only be removed from a 

patient along with those larger systems.” Cal. Stem Cell, 2020 WL 1289543 at *8; 

but see id. at *8 n.12 (“[T]he Government attorney asserted that technology to 

remove only cells did exist. However, no evidence was submitted on this point.”). 

Therefore, the court concluded, the FDA’s characterization would “eliminate[] the 

possibility of a cell removal and implantation,” and thus fail to give “full effect to 

all words” in the regulation. Id. at *8. 

For its part, the FDA focuses upon the word “such.” The regulation exempts 

only establishments that remove HCT/Ps from a patient and implant “such 

HCT/Ps” back into the same patient. As the district court in this case correctly 

explained, the word “such” in legal documents is typically used to refer back to an 

antecedent. See 403 F. Supp. 3d at 1288-89. Here, this means the HCT/Ps 

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implanted must be the same as the antecedent HCT/Ps – that is, the HCT/Ps that 

were removed. If significant processing steps expose the HCT/Ps to foreign 

substances and alter their form prior to reimplantation, then the HCT/Ps cease to be 

the same as they were at the time of removal. This interpretation seems, at the 

outset, to be the more natural of the two readings. 

The FDA’s view is all the more persuasive because it is consistent with its 

early (as well as its recent) pronouncements, see Skidmore, 323 U.S. at 140, and 

consonant with the history and purpose of the regulation, Kisor, 139 S. Ct. at 2415. 

In 2001, when the FDA first proposed the rule that would become § 1271, it 

received just one comment on the same surgical procedure exception. Final Rule, 

66 Fed. Reg. at 5460. Responding to that comment, the FDA noted that certain 

ways of processing an HCT/P could render the exception inapplicable, giving the 

example of cell or tissue expansion. Id. Specifically, the FDA was asked whether 

the exception covered “hospitals retaining [a patient’s own] tissue ... to be used in a 

subsequent application on the same patient.” Id. The FDA indicated the exception 

would apply in that scenario “so long as the hospital does not engage in any other 

activity encompassed within the definition of ‘manufacture’.... For example, if the 

hospital expanded the cells or tissues, it would not meet the terms of the 

exception.” Id. “Manufacture” encompasses “the recovery, processing, storage, 

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labeling, packaging, or distribution of any human cell or tissue.” 21 C.F.R. § 

1271.3(e). The FDA’s response therefore implied that more than ordinary 

processing would make the exception inapplicable. Thus, from the start, the FDA 

treated “such HCT/Ps” as meaning HCT/Ps in their original form, not subjected to 

significant processing, and informed the public of this understanding. Cf. Bostock 

v. Clayton Cty., 140 S. Ct. 1731, 1738 (2020) (instructing courts to interpret a law 

“in accord with the ordinary public meaning of its terms at the time of its 

enactment”). 

After establishments such as the Clinic began offering adipose-derived stem

cell therapies, the FDA issued a Guidance Document expounding on the 

application of the same surgical procedure exception to these therapies. The 

agency was of the view that when a procedure involves “intervening processing 

steps beyond rinsing, cleansing, sizing, or shaping,” the same surgical procedure

exception usually will not apply. Guidance Document at 3. This is because while 

“limited handling, such as rinsing and cleansing ... solely to remove debris (e.g., 

lipids, blood, bone particles)” presents no special risks, “processing steps ... for cell 

isolation, cell expansion, cell activation, or enzymatic digestion” raise “safety 

concerns, such as contamination and cross-contamination, beyond those typically 

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associated with surgery.”1 Id. at 7. Therefore, an establishment that merely 

removes and reinjects adipose tissue into a patient would generally qualify for the 

exception, but an establishment that uses enzymatic digestion to isolate the stem 

cells from the tissue before reinjection would not. Id. at 7-8. The Guidance 

Document is well-reasoned, explaining how its conclusion follows from the FDA’s 

original understanding of the same surgical procedure exception.

Because the plain text of the regulation suggests that “such HCT/Ps” must 

be in their original form (rather than subjected to extensive processing), and 

because this understanding is confirmed by the agency’s contemporaneous

statements and its later, thoroughly-considered interpretation, we hold the same 

surgical procedure exception unambiguously does not apply to the Clinic’s 

procedure. The stromal-vascular fraction solution is the product of an intensive 

cell isolation process involving enzymatic digestion that goes much farther than

simple rinsing or sizing. By the time the stromal-vascular fraction is reinjected, it 

is no longer “such HCT/P” as the adipose tissue removed from the patient. 

1 Recall that the rationale for the same surgical procedure exception was to carve out HCT/Ps 

that present “communicable disease risks, as well as safety and effectiveness risks,” that are “no 

different from those typically associated with surgery.” Proposed Approach at 12. 

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B. 361 HCT/Ps exception

The district court held that the stromal-vascular fraction solution was not a 

361 HCT/P because, as a matter of law, the Clinic did not intend the stromalvascular fraction solely for homologous use. That is, the Clinic intended the 

stromal-vascular fraction to perform at least some functions in its patients after the 

procedure that are distinct from the basic functions it performs inside the adipose 

tissue prior to the procedure. The Clinic claims this was error. It argues there was 

at least some evidence to the contrary, from which a reasonable fact-finder could 

arrive at the opposite conclusion, so the district court should not have granted the 

FDA summary judgment on this issue. 

Rather than attempt to refute the Clinic’s argument, the FDA urges us not to 

consider it. According to the FDA, to satisfy the homologous use criterion, the 

Clinic would need to intend for the stromal-vascular fraction to serve the basic 

functions of adipose tissue after the procedure (viz., “cushioning and support”). It 

says the Clinic forfeited any argument to the contrary first by failing to raise it 

before the district court, and again by failing to raise it on appeal. We see no 

forfeiture in either court. 

In the district court, the FDA raised the homologous use criterion in its 

motion for summary judgment. It assumed, without analysis, that the relevant 

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“basic function or functions” were those of adipose tissue. In its response, the 

Clinic disputed the FDA’s assumption: “the regulation ... is silent as to which 

HCT/P is the appropriate comparative unit ... thus allowing for the [stromalvascular fraction] cells to serve as the appropriate unit of comparison.” The Clinic 

asserted that it intends the stromal-vascular fraction to “provide a regenerative 

function” after the procedure, just as it does before the procedure, so the 

homologous use criterion is satisfied. In its reply, the FDA disagreed and argued 

in the alternative that the Clinic intended the stromal-vascular fraction to do more 

than serve a vague regenerative function. This back-and-forth was sufficient for 

each side to preserve its position in the district court.

On appeal, the Clinic adequately restates its position that the proper 

benchmark is the basic function of the stromal-vascular fraction in adipose tissue

(viz., “regeneration and repair”). We agree. Unlike the same surgical procedure 

exception, the 361 HCT/P exception and definition of homologous use do not 

require that an establishment remove an HCT/P from a patient and reimplant “such 

HCT/P” into the same patient.2

 There is no reason, therefore, the court should not 

compare stem cells to stem cells. 

2 Throughout its briefs, the FDA attempts to graft the requirements of the 361 HCT/P exception 

onto the same surgical procedure exception and vice versa. This is a mistake. As the FDA has 

itself said, “[t]he assessment of whether the [same surgical procedure exception] applies is 

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Nevertheless, we agree with the district court that the Clinic did not intend 

the stromal-vascular fraction solely for homologous use.

3

 The Clinic has 

consistently maintained that the stromal-vascular fraction serves a “regenerative 

function” inside adipose tissue. To determine the Clinic’s “objective intent” for 

the stromal-vascular fraction’s function after the procedure, we must look to the 

Clinic’s marketing materials. 21 C.F.R. § 1271.10(a)(2). 

The Clinic marketed the stromal-vascular fraction procedure for the 

treatment of the plethora of conditions we described earlier. The district court was 

plainly correct that “providing a regenerative function in the donor is [not] the 

same basic function as restoring cell function, contributing to anti-inflammatory 

processes, and otherwise treating [a] litany of illnesses in the recipient.” 403 

F. Supp. 3d at 1298 (citing Final Rule, 66 Fed. Reg. at 5458 (explaining 

“promotion of an HCT/P for an unproven therapeutic use, such as curing cancer,” 

would be a nonhomologous use)). No reasonable fact-finder could disagree. 

independent from the determination of whether the HCT/P meets the criteria [of the 361 HCT/P 

exception].” Guidance Document at 4. 

3 The Government did not make this argument in its brief on appeal, perhaps out of unwarranted 

confidence in its forfeiture argument. Still, “[w]hen an issue or claim is properly before the 

court, the court is not limited to the particular legal theories advanced by the parties.” Kamen v. 

Kemper Fin. Servs., 500 U.S. 90, 99 (1991); accord Walker v. Prudential Prop. & Cas. Ins. Co., 

286 F.3d 1270, 1275 n.4 (11th Cir. 2002) (“When addressing the issues in a case, we are not 

precluded by counsel from applying the law to the record before us”). 

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III. Conclusion

For these reasons, neither the same surgical procedure exception nor the 361 

HCT/Ps exception applies to the Clinic’s surgical practice. The Clinic did not 

challenge the district court’s judgment upon any other ground. Accordingly, we 

AFFIRM the judgment of the district court.

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JORDAN, Circuit Judge, concurring: 

I concur in full in Judge Ginsburg’s opinion for the court, and write separately 

concerning footnote 3, which explains that we can address the “homologous use” 

issue even though the FDA chose not to brief it on appeal. 

It is generally true that an appellate court can affirm on any ground supported 

by the record. See, e.g., Long v. Comm’r of IRS, 772 F.3d 670, 674 (11th Cir. 2014). 

Nevertheless, we have held a number of times that an appellee abandons an 

alternative ground for affirmance on the merits by not raising it in its answer brief. 

See, e.g., Reaves v. Sec’y, Fla. Dept. of Corrections, 872 F.3d 1137, 1149 n.4 (11th 

Cir. 2017); Hamilton v. Southland Christian School, Inc., 680 F.3d 1316, 1318-19 

(11th Cir. 2012); La Grasta v. First Union Sec., Inc., 358 F.3d 840, 847 n.4 (11th 

Cir. 2004); Johnson v. Wainright, 806 F.2d 1479, 1481 n.2 (11th Cir. 1986); 

Pennington v. Spears, 779 F.2d 1505, 1506 (11th Cir. 1986). 

There are good reasons for this default rule of abandonment. First, our 

adversarial system operates on the premise that parties represented by competent 

counsel “know what is best for them, and are responsible for advancing the facts and 

argument[s] entitling them to relief.” United States v. Sineneng-Smith, 140 S.Ct. 

1575, 1579 (2020) (discussing and applying the party-presentation principle). 

Second, if we address and decide an issue not raised by the parties, we do so without 

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the critical assistance that focused briefing can provide, and risk depriving the losing 

side of the opportunity to be heard, which is the essence of due process. See 

Brinkerhoff-Faris Trust & Sav. Co. v. Hill, 281 U.S. 673, 681 (1930).

Having said this, I recognize that the abandonment rule (sometimes called the 

waiver rule) is prudential in nature. See Herrera v. Wyoming, 553 U.S. 851, 861 

(2008); Day v. McDonough, 547 U.S. 198, 209 (2006). But the Supreme Court has 

recently told us that deviation from the party-presentation principle is reserved for 

“extraordinary” circumstances. See Sinengeng-Smith, 140 S.Ct. at 1579. I doubt 

that such circumstances exist here given that the FDA is the quintessential 

sophisticated litigant—a specialized government agency represented by experienced 

counsel. But the “homologous use” issue was briefed below, and decided by the 

district court, see United States v. US Stem Cell Clinic, 403 F.Supp. 3d 1279, 1296-

98 (S.D. Fla. 2019), so it seems that there is at least a somewhat stronger claim for 

us reaching the issue sua sponte on appeal. 

Despite my hesitation about the propriety of sua sponte consideration of 

merits issues, I do not dissent or concur on different grounds. That is because we 

have precedent that permits the sua sponte consideration of the “homologous use” 

issue in the circumstances before us. See Olson v. Superior Pontiac-GMC, Inc., 776 

F.2d 265, 266-67 (11th Cir. 1985) (on rehearing). 

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Later this month we are going to hear an en banc case which provides an 

opportunity to set out definitive guidance as to when it is appropriate for us to 

consider and decide a merits issue on our own. See United States v. Campbell, 970 

F.3d 1342 (11th Cir. 2020), vacated and rehearing en banc granted, 981 F.3d 1014 

(11th Cir. 2020). I hope we conclude that sua sponte consideration and resolution 

of such an issue should be the rare exception, justified only by truly extraordinary 

circumstances.

USCA11 Case: 19-13276 Date Filed: 06/02/2021 Page: 23 of 23