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Michigan Court Rules Preliminary Breath Test Results Admissible For Crimes Other Than DUIs
Even before you are arrested, the police in Michigan can often conduct a search of your breath using a portable or preliminary breath test device. The purpose of these tests is to determine how much alcohol is in your body. However, these portable breath testers have significant limitations relative to the reliability of the results reported. This is because of the way these portable breath testers measure alcohol. Because these limitations are well recognized in the scientific community, the law usually precludes them from being entered into evidence.
For example, in drunk driving cases, results from breath tests taken at the roadside are generally inadmissible. There are exceptions making preliminary breath test results admissible into evidence, and these are set for in Michigan Compiled Laws sec. 257.625a(2)(b).
However, these exceptions may not apply to other types of criminal activity in Michigan. For example, preliminary breath tests would be admissible on the charge of Possession of a Firearm Under the Influence, a crime set forth in Michigan Compiled Laws sec. 750.237.