52 | Driver’s Manual It can be a criminal offense to drive while  impaired by the effect of drugs or alcohol and  drugs, illegal drugs like marijuana, cocaine, LSD,  heroin and opium and by some prescription drugs  like tranquilizers. Drugs can affect your reflexes,  judgment, vision and alertness in ways similar  to alcohol and they may have other dangerous  effects as well. A combination of alcohol and other drugs se- verely reduces your ability to drive and can cause  serious health problems, which can include death. Many people think chemical test evidence is re- quired to prove you were intoxicated or impaired.  However, the testimony of a police officer about  the way you drive, your appearance and behavior  when arrested can provide enough evidence to  convict you, even without a chemical test. If you are found guilty of any alcohol or drug-re- lated violation, the court must revoke or suspend  your driver license when you are sentenced. Even  if the court allows you to continue driving for 20  days, your driver license will be taken immediately. The BAC standards and penalties for commer- cial drivers are even tougher than those indicated  in this chapter. For complete information, see Sec- tion 1 of the Commercial Driver’s Manual (CDL-10). In New York State, you can be arrested for  any of these offenses: aggravated driving while  intoxicated (Agg-DWI), driving while intoxicated  (DWI), driving with a blood alcohol content of .08  percent or more (.08 BAC), driving while ability im- paired by a drug (DWAI-drug), driving while ability  impaired by alcohol (DWAI), or driving under the  combined influence of alcohol and drugs. Blood alcohol content (BAC) is the percentage  of alcohol in your blood and is normally deter- mined by a chemical test of breath, blood, urine  or saliva. A BAC of more than .05 percent is legal  evidence that you are impaired, a BAC of .08  percent or higher is evidence of intoxication, and  a BAC of .18 percent or more is evidence of aggra- vated driving while intoxicated. Your BAC does not depend on the type of bev- erage you drink, how fit you are, or how you can  “hold your liquor.” YOUR BAC ALCOHOL, OTHER DRUGS AND THE LAW Your blood alcohol content (BAC) depends on: • How much alcohol you drink. • How much time passes between drinks. • Your weight. .02 BAC = OR OR OR 5 oz. glass of wine  12% alcohol 1 1⁄2 oz. liquor 80 proof  12 oz. (360 ml) can of beer 5% alcohol 12 oz. wine cooler 5% alcohol