MI HB5961

Amends section 625a of the Michigan Vehicle Code to allow peace officers to establish "reasonable cause to believe" for DUI arrests based on observations from anonymous tipsters or other persons, not just the officer's own observations.

Permits arrests without a warrant for suspected drunk driving violations based on reasonable cause derived from identified or anonymous third-party reports relayed to law enforcement.

Allows preliminary chemical breath analysis results to be used as evidence in criminal prosecutions and administrative hearings to support arrest validity or rebut testimony about the defendant's blood alcohol content.

Establishes that refusal to submit to a preliminary breath analysis constitutes a civil infraction for regular drivers, but a misdemeanor (up to 93 days imprisonment or $100 fine) for commercial motor vehicle operators, with a mandatory 24-hour out-of-service order.

Requires peace officers to use preliminary breath analysis results to determine whether to issue out-of-service orders for commercial drivers under section 319d.