Michigan Drunk Driving Defenses


Some common defenses to a drunk driving charge include:

  • Whether the driver was impaired and/or intoxicated through the use of alcohol


  • Whether the driver was "operating" a motor vehicle on a public roadway


  • The legality of the traffic stop


  • The police officer's reasonable suspicion to investigate a driver's sobriety


  • The police officer's probable cause to detain the motorist


  • Whether the officer had probable cause to effectuate an arrest


  • The sufficiency of the evidence against the driver


  • Whether the officer's training and other qualifications provided adequate skill in conducting the investigation

  • Whether field sobriety tests were performed correctly and whether those tests showed sobriety


  • The validity of the chemical body analysis


  • Whether the chemical testing was performed within a reasonable time of the traffic stop


  • Whether administrative rules were complied with by the police officer


  • Whether jurisdictional matters are proper




  • Some or all of the above matters may be a defense in any particular case. Careful review of the police reports, chemical testing results, the DI-177, videotapes, audiotapes, and radio transmissions may reveal weaknesses in the prosecution's case, resulting in a reduced plea to a non-alcohol offense or dismissal of the charges.


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