Michigan has a number of separate but related charges for drivers who are impaired due to something they have ingested. These charges are to ensure that dangerous drivers don't slip through the system unpunished:

• Operating While Visibly Impaired (OWVI): Your inability to operate a motor vehicle was visible to the arresting officer, most likely due to the presence of alcohol or other drugs in your body. You don't need a BAC of 0.08 or above to be charged with OWVI.

• Operating While Intoxicated (OWI): Alcohol or drugs in your body substantially affected your ability so you could not operate a motor vehicle safely. OWI can also mean that―when tested in the field, at the police station, or at a hospital―your blood alcohol concentration (BAC) was at or above 0.08%.

• Operating With Any Presence of a Schedule 1 Drug or Cocaine: Even if you don't appear intoxicated or impaired, if you have even a trace of these drugs in your blood (as determined by a chemical test of your blood, breath, or urine), you can be charged.

• Under Age 21 Operating with Any Bodily Alcohol Content: As a minor, you'll be charged if you have a BAC of 0.02 to 0.07 or any presence of alcohol other than that consumed at a generally recognized religious ceremony.