After a driver is pulled over for DUI, but before he is arrested, the driver may be asked to take a hand-held preliminary alcohol screening (PAS) breath test. This is basically a roadside breath test. And, it is just another field sobriety test (FST) – like walking in a straight line, or bringing a finger to the nose. An FST simply helps police decide whether or not to arrest someone for DUI. There is no penalty for refusing to take a PAS breath test unless a person is either: under the age of 21, or on probation for a prior DUI conviction. Further, as long as a person is at least 21 and not on DUI probation, refusal to take a PAS test may not be admitted at trial as evidence of guilt. Note though that if a driver does agree to a PAS test, the test results can be used to help convict him of a DUI.