In a car crash or other incident involving multiple vehicles the police may investigate whether the driver of any of the vehicles is under the influence of or intoxicated by alcohol or drugs, and are not limited to investigating and arresting only the driver who was at fault in the accident, for example.
In Michigan, when a car crash or other incident involving multiple vehicles occurs, law enforcement officers have the authority to investigate all drivers involved for potential intoxication or impairment by alcohol or drugs. This means that even if a driver is not at fault for the accident, they can still be subject to investigation and arrest if there is probable cause to believe they are under the influence. Michigan law, under the Michigan Vehicle Code (MCL 257.625), prohibits operating a vehicle while intoxicated or impaired by alcohol, controlled substances, or other intoxicating substances. Police officers can use field sobriety tests, breathalyzers, or other chemical tests to determine if a driver is impaired. If a driver is found to be in violation of these laws, they may face charges regardless of their role in the accident.