Michigan Public Act 315, of the 2014 Legislative Session, which amends M.C.L. 257.625a, was intended to help officers make more drugged driving arrests. But the new law, which was effective January 12, 2015 is making things more difficult for prosecutors. Before the amendment, Michigan law permitted a police officer require a driver submit to a preliminary chemical breath analysis if the officer has reasonable cause to believe that the person was operating a motor vehicle while intoxicated
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