Blood Alcohol Level refers to the amount of alcohol in your blood. A blood level of 0.05% indicates that you have 50 milligrams of alcohol in 100 milliliters of your blood. A BAL of 0.05 or higher indicates that your body system has been affected in the following way: you have reduced coordination, lowered alertness, impaired judgement, uninhibited behavior, etc. In this condition, you are considered totally unfit for driving.