High BAC and chemical test challenges in Michigan

Usually yes. The statute sets no deadline for a chemical test: MCL 257.625a(6)(a) makes the result admissible and presumes it matches your level when you drove. In People v Wager, a blood test given 128 to 140 minutes after the crash came in, and the Supreme Court held that delay goes to weight, not admissibility, and that the prosecutor need not call an opinion witness to connect the number to the time of driving. Delay is an argument to the jury, not a ground to exclude.

The presumption in MCL 257.625a(6)(a) is rebuttable, and a 0.17 charge still requires proof of a level of 0.17 or more under MCL 257.625(1)(c). So the real fight is often what your level was while driving. In Wager, the defense called a university professor who described alcohol levels rising, plateauing, and then falling, and said a later test could not reliably be extrapolated back. The jury convicted anyway, and the Supreme Court reinstated the conviction. The facts that matter are what you drank, when you stopped, what you ate, and the clock times of driving, arrest, and test. A rising-level defense has a trap. In People v Parrott, the driver's witness was expected to say his level was under 0.08 while driving and rose afterward, but the court affirmed exclusion of his roadside breath test. MCL 257.625a(2)(b) allows that test in narrow situations, such as challenging the arrest or rebutting cross-examination testimony that the level was higher at the offense than at the chemical test, and a rising-level defense fits neither. The prosecutor gets a use too: it may offer the roadside test to rebut testimony, brought out on cross-examination of a prosecution witness, that your level was lower at the time of driving than at the chemical test, so questions to the officer or analyst about a rising level can open that door. The court noted he could still offer the opinion testimony without it.

Authority: MCL 257.625a; MCL 257.625; People v Wager, 460 Mich 118 (1999); People v Parrott, 335 Mich App 648 (2021). Reviewed Oct. 2026.

The State Police write the testing rules under MCL 257.625a(6)(g), and two are often litigated: a 15-minute observation period before the sample (Mich Admin Code, R 325.2655(e)) and a weekly accuracy check for instruments that do not test a known standard with each subject (R 325.2653(1)). A violation does not automatically exclude the result. Michigan courts suppress only when the deviation calls the test's accuracy into question; otherwise the point goes to weight. The argument is what the deviation did to reliability.

The current observation rule requires the operator to watch you for at least 15 minutes before the sample, during which you must not smoke, regurgitate, or put anything in your mouth. The operator need not stare, and a break of a few seconds does not invalidate the observation if the operator can reasonably tell nothing entered your mouth. In People v Wujkowski, about six seconds out of view was harmless, and the court contrasted People v Boughner, where video showed observation for no more than eight minutes. The weekly rule requires verification of an evidential instrument at least once a calendar week, but R 325.2653(2) exempts instruments that check a known standard with every subject test. People v Rexford read calendar week as Sunday through Saturday and found a violation where one week was missed, yet held suppression was not required and the missed test went to weight. People v Fosnaugh states the test: suppression is required only when a deviation calls the accuracy of the test into question. A reading near 0.17 sits at the line for the longer jail range, so reliability evidence matters. The cases applied earlier versions of the rules, so check the current text.

Authority: MCL 257.625a; Mich Admin Code, R 325.2655(e); Mich Admin Code, R 325.2653(1)-(2); People v Wujkowski, 230 Mich App 181 (1998); People v Rexford, 228 Mich App 371 (1998); People v Fosnaugh, 248 Mich App 444 (2002); People v Boughner, 209 Mich App 397 (1995). Reviewed Oct. 2026.

Usually yes. In People v Fosnaugh, the first reading was 0.18 and the second test aborted as an invalid sample because the machine detected mouth alcohol. The Court of Appeals held that no third test was required and that suppressing the first result was error. Under the current rule, the first sample is enough for evidentiary purposes and the second only confirms it, so a missing confirmation goes to weight. The trap is mouth alcohol or an observation lapse before the first sample.

The current rule, Mich Admin Code, R 325.2655(f), says the operator requests a second sample unless something is found in your mouth after the first analysis that could interfere with the result. It also says the first result is enough for the implied consent statute's evidentiary requirements and that the second sample exists to confirm the first. Under subdivisions (g) and (h), a third sample is required only when the second differs from the first by more than the rule's table allows. An invalid-sample message is not such a difference. Fosnaugh applied the earlier version of these rules. It found no evidence that the machine would have missed mouth alcohol on the first sample but caught it on the second, so the lack of a confirming result went to weight. The operator manual said the operator should start a new 15-minute observation period and repeat the test, but the court read should as not mandatory in that context. The answer changes if the facts show the first sample was itself affected, such as regurgitation or something placed in the mouth during the observation period, which raises the accuracy question. Check the current rule text and manual.

Authority: MCL 257.625a; Mich Admin Code, R 325.2655(f)-(h); People v Fosnaugh, 248 Mich App 444 (2002). Reviewed Oct. 2026.

Possibly, but it is hard. A blood draw is a search, so without a warrant the prosecutor must prove your consent was freely and voluntarily given, and mere acquiescence to authority does not do it. But in People v Stricklin, the Court of Appeals held that consent given after the standard warning was not involuntary solely because the driver feared losing his license. Police cannot draw blood as a search incident to arrest after Birchfield, so these cases turn on consent, a warrant, or exigency.

Birchfield v North Dakota held that a breath test, but not a blood test, may be required as a search incident to a lawful drunk-driving arrest. Missouri v McNeely held that natural dissipation of alcohol is not an exigency in every case. A plurality in Mitchell v Wisconsin later said police may almost always order a warrantless blood draw of a driver whose unconsciousness or stupor requires hospital transport before a breath test, so that is one recognized exigency situation. In Stricklin, the officer read the standard warning of suspension and 6 points, which tracks MCL 257.625a(6)(b), and the driver agreed to the draw. The district and circuit courts suppressed the result, but the Court of Appeals reversed. Exigency was not argued on appeal, and the driver testified he understood he could refuse, that the officer could seek a warrant, and what a conviction would cost, so the court called it a hard choice, not no choice. The record was sparse. Voluntariness turns on the totality of the circumstances, including what you were told, the nature of the detention, and your age and education, and People v Chowdhury puts the burden on the prosecutor.

Authority: MCL 257.625a; People v Stricklin, 327 Mich App 592 (2019); People v Chowdhury, 285 Mich App 509 (2009); Birchfield v North Dakota, 579 US 438 (2016); Missouri v McNeely, 569 US 141 (2013); Mitchell v Wisconsin, 588 US 840 (2019). Reviewed Oct. 2026.

The license sanction follows the conviction, so a reduction changes it. With no prior conviction in 7 years, a 0.17 conviction under MCL 257.625(1)(c) means a one-year suspension, no restricted license for 45 days, and an ignition interlock on any restricted license. A conviction under (1)(a) or (1)(b) brings 180 days with a 30-day wait, and OWVI under (3) brings 90 days. A reduction does not clear the record, because OWVI and OWI both count as prior convictions.

These figures assume no prior conviction within 7 years. For jail and fines, MCL 257.625(9)(a) allows up to 180 days and $200 to $700 for (1)(c), against 93 days and $100 to $500 for (1)(a) or (1)(b). OWVI under (11)(a) carries up to 93 days and a fine of up to $300. The interlock condition in MCL 257.319(8)(h) is tied to a (1)(c) conviction, but a court can still order an interlock as a probation condition after a conviction under (1), under MCL 257.625(24). Points are 6 for (1) and 4 for (3) under MCL 257.320a. If the Secretary of State receives two convictions from one incident, MCL 257.319(12) imposes only the longest suspension. A court order does not change a suspension unless it complies with MCL 257.323, under MCL 257.319(11). A charge under (1) or (3) cannot be reduced to a plea under (6), the under-21 offense, in exchange for dismissal, under MCL 257.625(16). Whether any reduction is offered is up to the prosecutor and the court, and this is general information, not a prediction.

Authority: MCL 257.625; MCL 257.319; MCL 257.320a. Reviewed Oct. 2026.