Zero Tolerance for Drivers under 21 in DUI casesThis means that any driver under 21 that is stopped by law enforcement and has a blood alcohol level of .02 or higher will automatically have their Florida drivers license suspended for 6 months. The .02 limit really means that you cannot have a single drink and drive. And that's the idea.For drivers over 21 the legal limit in Florida is .08. Regardless of your age be aware that drinking and driving is considered a serious offense. It is estimated that the average cost incurred by a driver convicted of a DUI is $8000.00, which includes legal defense, fines, and auto insurance increases.