How many alcoholic drinks can a driver who is over 21 consume before he or she will exceed the legal blood alcohol limit?

For a driver who is at least 21 years of age, the legal limit for blood alcohol concentration (BAC) is under 0.08%. The number of alcoholic drinks it takes to exceed that limit depends on such factors as the driver's weight. The lower your weight, the higher your BAC for the same amount of alcohol.