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 Pennsylvania, 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. 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. Pennsylvania's Vehicle Code (Title 75) grants police officers the power to conduct field sobriety tests and use chemical testing to determine a driver's level of intoxication. If a driver is found to be driving under the influence (DUI), they can face charges regardless of their role in the accident. The state's DUI laws apply to all drivers on the road, and there is no exemption for non-at-fault drivers in the event of a multi-vehicle incident.