Florida prohibits driving or being in actual physical control of a vehicle while: having a blood alcohol concentration (BAC) of .08% or more, or under the influence of alcohol, harmful chemical substances, or illegal controlled substances. Many people don’t know exactly how many drinks it takes to get to 0.08%, the magic number for legal intoxication where it is no longer legal for a person older than 21 to drive. That is because an individual’s blood alcohol content can be affected by various factors: age, gender, weight, food consumption and more.