In Canada, BAC (blood alcohol concentration) is the measurement of the amount of alcohol in a person’s blood. The more you drink, the higher the level of BAC. You cannot exceed the legal limit of BAC if you plan to drive a vehicle; even one drink means you cannot drive that day. In Canada an Over 80 charge means you’ve been suspected of drunk driving and your blood/alcohol level is above the allowed maximum of 80mgs of alcohol per 100 milliliters of blood.