DUI - Drunk Driving
Driving under the influence (DUI) is also known as driving while intoxicated (DWI), drunk driving, or impaired driving. It is the name of the crime for driving a motor vehicle while impaired by alcohol or drugs. It is based on the Blood Alcohol Content (BAC) of a person operating a motor vehicle. It is a predetermined amount of alcohol in the blood that renders the driver incapable of safely operating a motor vehicle. The level of alcohol in someone's body is known as the "blood alcohol content" (BAC).
If the police suspect someone may have been drinking while driving, they will field test someone to see if they are over the legal limit.