People v. Epstein
215 N.E.3d 793
Ill.2022Background:
- Laura Epstein was charged with three counts of aggravated DUI (including driving with a BAC ≥ .08 and transporting a child under 16, with a prior DUI allegation).
- Blood was drawn pursuant to warrant about four hours after a traffic stop and tested at BAC 0.107.
- Epstein moved pretrial to exclude the BAC result under Illinois Rule of Evidence 403, arguing retrograde extrapolation could not reliably show BAC at the time of driving.
- Defense expert Dr. James O’Donnell testified he could not perform retrograde extrapolation because Epstein was likely still absorbing alcohol at the time of the stop and her peak BAC occurred later.
- The trial court excluded the BAC result as unfairly prejudicial; the appellate court reversed and remanded. The Illinois Supreme Court affirmed the appellate court and remanded for further proceedings.
Issues:
| Issue | People’s Argument | Epstein’s Argument | Held |
|---|---|---|---|
| Admissibility of a postarrest BAC drawn ~4 hours after stop under Ill. R. Evid. 403 | The 0.107 result is highly probative of drinking before and intoxication while driving; delay affects weight, not admissibility | The result is inherently unreliable to prove BAC while driving; admitting it would mislead jury and be unfairly prejudicial | Court held the result was relevant and its probative value was not substantially outweighed by unfair prejudice; admit and let jury weigh it |
| Whether retrograde extrapolation is a prerequisite to admit a high postarrest BAC | Not required; extrapolation goes to weight, not foundational admissibility | Without reliable extrapolation the jury will be misled into inferring BAC > .08 at driving | Court: extrapolation is not a prerequisite; expert challenges go to weight and credibility |
| Whether admitting the BAC creates an unconstitutional mandatory presumption shifting burden to defendant | N/A (State argues no unconstitutional effect) | Admission would function as an irrebuttable presumption that Epstein drove over the limit, violating due process | Court held admission does not create a mandatory presumption; the jury may accept or reject the evidence |
| Appropriate remedy when expert says BAC cannot be retroactively determined | Admission and let jury assess competing evidence (including defense expert) | Exclusion under Rule 403 as prejudicial and misleading | Court reversed exclusion; remanded for trial where jury decides credibility and weight |
Key Cases Cited
- People v. Zator, 209 Ill. App. 3d 322 (1991) (delay between driving and test affects weight, not per se inadmissibility)
- People v. Call, 176 Ill. App. 3d 571 (1988) (same principle regarding postarrest test delay)
- People v. Newman, 163 Ill. App. 3d 865 (1987) (surrounding circumstances govern weight of delayed tests)
- People v. Pomykala, 203 Ill. 2d 198 (2003) (distinguishes permissive and mandatory presumptions in criminal proof)
- People v. Watts, 181 Ill. 2d 133 (1998) (permissive presumptions do not relieve prosecution of burden)
- People v. Moss, 205 Ill. 2d 139 (2001) (describes jury’s role in assessing credibility and weighing evidence)