In the state of Pennsylvania to be charged with a DUI, a police officer will have pulled you over under the suspicion of driving under the influence and will generally ask you to conduct a breathalyzer test or blood test. They are testing to see if your blood alcohol concentration or BAC level is higher than the allowed limit of .079 percent. If a person blows a .08 or higher for their BAC level they can then be charged with a DUI.