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Refusing a breathalyzer test in Michigan has consequences. By driving on Michigan roads, you’ve agreed under the law to submit to a breathalyzer if suspected of OWI. Refusal results in a civil infraction and an automatic license suspension for one year. If it’s your second refusal within seven years, the suspension extends to two years. For commercial drivers, refusal also leads to a mandatory 24-hour out-of-service period.