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 Arizona, when a car crash or other incident involving multiple vehicles occurs, law enforcement officers have the authority to investigate all drivers involved for potential impairment due to alcohol or drugs, regardless of who is at fault for the accident. Arizona's DUI laws are strict, and the state follows an 'implied consent' rule, meaning that drivers automatically consent to BAC testing when they operate a vehicle. If a driver refuses to submit to a BAC test, they can face license suspension and other penalties. If an officer has reasonable suspicion that a driver is under the influence, they can conduct field sobriety tests and use the results as grounds for arrest. The investigation and potential arrest for DUI are not limited to the at-fault driver; any driver involved in the incident can be subject to these legal actions if there is evidence of impairment.