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Drunk Driving Defense: Widmark Calculations | JEC
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How DWI lawyers can expose the charade of the prosecution’s expert.
Widmark Calculations and Presumption That Defendant Is Guilty
Typical Presentation of Calculations
Widmark Variables
Cross-Examining on Widmark Variables
Checklist for Attacking Widmark Calculations
Widmark Calculations in Breath Cases
The secret to winning any case is to first identify and then solve the predominant problem in the case. Only then do jurors begin to become receptive to what the lawyer considers to be the real issues in the case.
Lawyers think in terms of proving their case. For example, a personal injury lawyer wants to prove the plaintiff’s cause of action, a prosecutor wants to establish the corpus delecti, and a defense attorney wants to raise reasonable doubt. These are important, but what the lawyer really needs to be concerned with is how is he or she going to solve the predominant problem in the case. Until the predominant problem in the case is identified and solved (or at least lessened in impact), jurors will remain resistant to the evidence presented by the lawyer.
The Predominant Problem in Drunk Driving Cases
§10:30 Presumption That the Defendant Is Guilty
You can identify the predominant problem for the defense in a drunk driving case simply by talking to someone who is not a lawyer. Try this experiment: talk to five laypersons and tell them you are about to start a trial defending someone accused of drunk driving. See if there is a common concern.
Now reflect back on the last five pretrial conferences you had with the judges in drunk driving cases. Note the concerns the jurists had in those conferences. They parallel the concerns expressed by the laypersons.
Simply stated, most prospective jurors and judges are going to be of the opinion that the result in a drunk driving case is a forgone conclusion. And that conclusion is that your client is guilty. This is the predominant problem in defending drunk driving cases.
Jurors may even enunciate in voir dire that the case must be “cut and dried.” These jurors are certain that there will be a blood or breath test confirming their belief that the outcome of the trial is a foregone conclusion.
Similarly, the judge anticipates an early guilty plea by the defendant, and this stalls effective plea negotiations with the prosecutor. Judges will often ask the defense attorney what the defense is going to be. Note that the judge does not ask the prosecutor how the prosecutor is possibly going to prove the state’s case. Judges ask defense counsel this question because many of them cannot believe that you are serious about spending the next three days in trial on a .15% drunk driving case.
When you are invited into chambers before a drunk driving trial be prepared to respond to the judge’s inquiry about what your defense is going to be. On the one hand, you do not want to reveal the theory of your defense to the prosecutor. On the other hand, failing to respond to the court’s question is not an easy option. Be prepared with a truthful, but general answer. One way to lessen the risk of the court trying to ferret out of you the defense is by pretrial motions. Intelligent pretrial motion work will impress the court that you are not wasting the court’s time. Thus, your actual conduct in the case will have preceded you before the pretrial conference. If the court presses you for the specifics of your defense, you must ultimately inform the court that you cannot answer the question with the prosecutor present. This is difficult because essentially what you do is tell the court that the court’s inquiry was inappropriate. Nonetheless, it must be done. The goal is to have the prosecutor piece together the defense as close as to the time of the defense’s closing argument as possible.
§10:31 Widmark Calculations and the Predominant Problem
However, when the jurors hear that in reality the Widmark calculations are actually nothing more than an educated guess, hopefully they will begin to question some of their initial assumptions. After the cross-examination on Widmark calculations many jurors may not be as predisposed to convict as when they were first seated. The defense campaign from the start is to get jurors to think “there is more to this than I thought—the case is not cut and dried.”
§10:40 Typical Presentation of Widmark Calculations
§10:41 Expose the Charade
At this point you really do not care what the answer is. The witness and the prosecutor have been exposed. If you are lucky, someone seated nearby in the jury box might begin to start thinking, if the case is so “cut and dried,” why is the prosecution going to such lengths to deceive us. The predominant problem for the defense is beginning to become solved.
If you are still concerned about venturing into this area without more assurance of a positive reply, then watch the prosecutor and the expert during any recess. It is a common practice to have a recess before the prosecutor puts on the state’s expert. Generally, the police officer is the first witness to testify, followed by the expert. After the officer’s testimony it is a natural time for the court to take a recess. Some prosecutors even ask for the recess so they can talk with their expert. You can sometimes see the expert and the prosecutor doing the computations with the calculator in plain view in the hallway or at the counsel table during the recess.
§10:42 Ask What the Formula Is
Next ask the expert what the Widmark formula is. Many experts will reply with a formula that is not the actual formula. These experts, instead use a shorthand version of the formula in court. This shorthand version of the formula does not accommodate any of the variables that are in the actual formula. [For the actual formula, see Chapter 9, Blood Alcohol Concentration and Widmark Calculations.]
§10:43 Ask Whether the Expert Has Read Widmark
Comment: Always use your client’s name; the term defendant is used here for ease of reference only.
Comment:Expert’s frequently use a burnoff rate of .02% an hour for no other reason than it makes calculations in court easier. The actual average rate is lower, although, the normal range extends beyond this point as well.
Comment:The witness will sometimes offer up some diversion hoping to avoid the next question. The examiner should simply make a mental note that the cross-examination appears to be working. Then plow straight ahead with your questioning.
Comment:The witness realizes he or she has been caught and tries to drag others down with the witness by using the word “we.”
Comment: This is a dodge to avoid answering the question of whether or not the expert knows what is in Doctor Widmark’s book. The witness would be better off acknowledging right away that he has not read the book. But the witness is still hopeful the question will never be presented.
Comment: The answer is 13. Again, if the witness had answered on his or her own that the witness had not read the book, the questions would have already ceased. Failure to do so prolongs the agony.
Comment: The answer is 10.
Comment: The answer is 20 men and 10 women.
Comment: The answer is he did not find any correlation.
§10:44 The Widmark Variables
There are two variables in the Widmark formulA: the ß factor and the r factor. [For an explanation of these variables, see Chapter 9, Blood Alcohol Concentration and Widmark Calculations.]
The important thing for lawyers to know about variables is that the numbers that can be placed in them are, by definition, variable. That is, they are not constant for all people. However, the shorthand formulas that the prosecution’s experts typically use assume constant variables for all people. These formulas assume that the defendant has an average r factor, and an average ß factor. In essence, the prosecution criminalist makes an educated guess about the defendant’s drinking.
This would not be so bad if the prosecution’s expert acknowledged that his or her calculations were based on assumptions. However, this is rarely done, and when it is done it is given only a passing reference. It is thus up to the defense attorney to explain to the jury the whole truth behind these calculations.
If the prosecution fails to explain the assumptions in their Widmark calculations, be sure to remind the jury about this in closing argument. Why did they not tell you they were making certain assumptions based on averages? Why did the prosecution not tell you that their use of a calculator was nothing more than a charade for you? Their expert knew the answer all along. And so do we. The answer is that the defendant is not guilty.
§10:45 Cross-Examining on the Widmark Variables
The following is an illustration of how to exploit the Widmark variables in the cross-examination of the state’s expert. Note how the cross-examination ends. If you feel that you can get to this point with the expert in your trial, it is a perfect way to end the entire cross-examination of the expert, regardless of the type of chemical test that was taken.
Q: You previously explained to us that there is a formula that you used to calculate the amount the defendant had to drink?
Q: That formula, does it have some variables in it?
A: Well, the formula I used contains constants in the formula in place of the variables. It has variables, but we use constants.
Q: I see, and by constants you mean averages?
Q: Now one of these averages you used was the ß factor in the formula, something we sometimes call the burnoff factor?
Q: You used a .02% burnoff factor for the defendant?
Q: Well, that is not even the average is it?
A: No, but it is quite close.
Q: If the defendant had a burnoff factor that was higher or lower than average would that affect your ultimate calculation?
Q: Well, what was the defendant’s ß factor on the night in question?
Comment: This is an opportune time to walk over to your client and lightly put a hand on the client’s shoulder while asking the question. It shows the jury in a subtle way that you are comfortable with your client, and conveys the point that your client is not some criminal. It is also good staging. The visual picture of walking over to your client makes the point of the question more memorable. Keep in mind that there will be a lot of facts introduced in the trial. No juror is going to remember all of them. Help the jurors remember the points you want to make with various types of emphasis. Voice inflection is one technique. Pausing after a key answer is another. Visual pictures, like walking over to your client while asking a question is a third method. Use them all.
Q: There is another variable in the equation as well isn’t there?
A: I think you are referring to the r factor.
Q: And this r factor it can range from .5 to 1.0?
A: I don’t think it’s that big of a range. Widmark found the average to be .68.
Q: You did not actually read that in his work though did you? [Remind the jurors of the witness’ earlier deception.]
A: Like I said I have not read the work, but I have seen papers on the subject.
Q: Well, did not Lewis publish a study in one of these papers, “The Individual and the Estimation of his Blood Alcohol Concentration from Intake with Particular Reference to the Hipflask Drink” in the Forensic Science Society that the range was from .5 to 1.0?
A: I am not familiar with the article.
Q: You do agree that there is a wide range for men and women?
A: There is a range. I used the average.
Q: If the defendant’s r factor is different from the average would that also affect your calculations?
Q: Well what is the defendant’s r factor?
Comment: Again, walk over to your client.
Q: Well, if you do not know what the defendant’s r factor is, and if you do not know what the defendant’s ß factor is, you cannot tell us what the defendant had to drink on the night he was arrested, can you?
A: I can if I make certain assumptions.
Q: And those assumptions are that he is the average man?
Q: And you don’t know if he is the average man, do you?
Q: Without that assumption, you cannot tell this jury what he had to drink?
Comment: Achieving this final concession does occur in actual practice. The chances of obtaining the complete concession depend on how much the witness has been battered in your cross-examination. If the witness has held up well, the witness is more likely to resist this concluding question by adding some qualifying proviso such as, “I cannot say for certain, but I can give you a good approximation.” On the other hand, if you sense a certain resignation of the expert, because the witness has been trumped one too many times, it is a good idea to shoot for this conclusion as a final point in your cross-examination.
§10:46 Checklist for Attacking Widmark Calculations
Hire an expert. If you do not think you need to hire an expert reread Chapter 9, Blood Alcohol Concentration and Widmark Calculations.
Focus on solving the predominant problem in the case. Everything should be coordinated toward reaching this goal.
Know Widmark’s formula. Have it in front of you when cross-examining the expert.
Know the averages used for the variables in Widmark’s equation. The average r factor is .68 for males, and .55 for females. The average ß factor is 0.15% per hour for men and women. Some more recent studies have found the ß factor to be .17% to .18% per hour.
Know the possible ranges for the variables in the Widmark formula. The ß factor ranges from .10% per hour to .25% pre hour. The r factor ranges from .5 to 1.0 for men (.60 to .87 is more commonly reported) to .44 to .80 for women.
Be prepared to expose the charade. Watch for the set up of the charade during court recesses.
In breath cases, look to see if you can get into partition ratios because of the claims made by prosecution’s expert about the defendant’s credibility by using Widmark calculations. [For more on this, see §10:50.]
Have some examples to give to the jury on why using averages to convict someone is inherently suspect. Make up your own. They are fun and easy to create.
§10:50 Calculations Attack Defendant’s Veracity
Widmark calculations take on special concerns when they are based on a breath machine rather than a blood test.
Typically, the prosecution’s expert opines that the defendant had more alcohol than the defendant told the police officer because the chemical test showed a higher alcohol concentration than the defendant reported.
The alcohol concentration measurement is based on what the defendant reported is obtained by using Widmark calculations. For example, the Widmark calculations may show that based upon what the defendant said he or she had to drink, the defendant’s blood alcohol level was .07 percent. However, a blood test may reveal a .12 percent blood alcohol concentration. The prosecutor’s expert then indicates that what the defendant told the police officer he or she had to drink could not have been true.
§10:51 Breath Machine Assumes a Partition Ratio
Breath machines assume that the concentration of alcohol in a person’s blood is 2100 times greater than it is in a person’s breath. It uses this relationship (known as a partition ratio) in calculating the blood alcohol concentration from a breath test.
Like any average, using one value can overstate or understate the true result. To take an extreme example, if a person’s partition ratio is 1050 to 1, instead of 2100 to 1, the breath test result will overstate the actual blood alcohol level by 50 percent. In this circumstance, the disparity in the results is not due to a misstatement by the defendant, but rather by the built-in error in the breath machine.
[For more on the partition ratio, see Chapter 11, Breath Testing.]
§10:52 Right to Attack Breath Machine’s Accuracy
In a breath case, if the state’s expert states that the defendant is not telling the truth based on Widmark calculations, the defense should consider arguing that the prosecution has opened the proverbial door to tell the jury the truth about breath machines and partition ratios. The defendant has a constitutional right to cross-examine witnesses. The witness is calling the defendant a liar, but it may be that it is really the machine that is lying. [For more on the right to cross-examine, see Pointer v. Texas, 380 U.S.400, 404 (1965) (defendant charged with robbery; court extended Sixth Amendment to the states). For how to introduce the variability of partition ratios into trial, see Chapter 12, Attacking Breath Tests.]
Many states preclude the introduction of evidence of the variance in individual partition ratios in breath cases notwithstanding the fact that such variances are universally accepted as true. The reason for this is that the legislature has defined the partition ratio as 2100 to 1. In effect, the legislature has ruled science out of the equation, and courts have upheld their right to do this. [See, e.g., People v. Capporelli, 502 N.E.2d 11, 15 (Ill. App. 1986) (constitutional challenge of statute using fixed ratio of 2100 to 1 denied; court stated that it cannot be said the legislature’s provisions are irrational); see also People v. Bransford, 8 Cal. 4th 885, 893 (California 1994) (consolidated drunk driving appeals denied defendants the right to introduce evidence that their individual partition ratios were different than 2100 to 1; the Supreme Court stated that the trial court correctly ruled such evidence is irrelevant and therefore inadmissible).]
Nevertheless, the right of cross-examination is still afforded an accused in a criminal trial. The value of cross-examination in exposing falsehood and bringing out the truth in trial has long been recognized. [See, e.g., 5 Wigmore, Evidence 1367 (3d ed. 1940).]
The Sixth Amendment right of confrontation is a fundamental right essential to a fair trial in a criminal prosecution. The United States Supreme Court has constantly emphasized the necessity for cross-examination as a protection for defendants in criminal cases. [See, e.g., Kirby v. United States, 174 U.S. 47, 55, 56, (referring to the right of confrontation as “[o]ne of the fundamental guarantees of life and liberty,” and “a right long deemed so essential for the due protection of life and liberty” that it is guarded against legislative and judicial action by provisions in the Constitution of the United States and in the constitutions of most if not of all the States composing the Union).]
What could afford more protection to the accused then the right to tell the jury the truth that the defendant was not lying when he told the officer what he or she had to drink on the night in question? The defense should argue that to protect the defendant from false claims made by the prosecution’s expert about the defendant’s veracity, the defendant has a federal constitutional right to tell the jury the truth about breath machines, partition ratios and Widmark calculations. If in a breath case the prosecution’s expert says that based upon the expert’s calculations the defendant must by lying, the door to partition ratios has been thrust open. [For more on attacking breath tests, and introducing partition ratios into trial, see Chapter 12, Attacking and Defending Breath Tests.]
Federalize the argument. You are asking the judge to tread into an area where the judge may feel a little uncomfortable. Provide the judge with some United States Constitutional backing.