In California driving with a BAC (blood alcohol content) of 0.08% or higher is illegal. If you are stopped by a police officer you can be arrested for DUI (driving under the influence). First, the officer will need to determine whether or not you are under the influence by performing one or more of several field sobriety tests. The tests can range from a walk and turn test to a more extensive test such as a blood, breath or urine test. Refusal to perform any of these tests when asked by the officer will most likely result in your immediate arrest and being booked in a county jail for DUI. A DUI charge and conviction can have dramatic affects on your future. An attorney experienced in defending people charged with driving under the influence will be able to help keep you out of jail.