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 Colorado, 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. Colorado's laws against driving under the influence (DUI) or driving while ability impaired (DWAI) apply to all drivers, regardless of their role in the incident. The state's legal blood alcohol content (BAC) limits are 0.08% for DUI and 0.05% for DWAI. If an officer has reasonable grounds to suspect a driver is impaired, they may administer field sobriety tests, breathalyzer tests, or require a blood test to determine the level of intoxication.