What Happens When You Get Sto pped for Impaired Driving? Getting stopped for suspected impaired driving is serious. It is a crime in all Canadian provinces to drive with a blood alcohol content (BAC) level above the legal limit of 80 milligrams of alcohol in 100 millilitres of blood (“Over 80”). The police pull you over: When you are stopped for suspected impaired driving (or for something else and a police officer thinks you have alcohol in your system), you will generally be required to take a roadside breath test to determine your BAC level. Refusing to blow into the roadside screening device is a criminal offence with penalties similar to impaired driving itself. Effective July 2008, new provisions of the Criminal Code permit a police officer to demand that you perform physical coordination tests. These physical coordination tests may even be video recorded.