This section covers material dealing with the observation and detection of drunken drivers both prior to, and during a traffic stop or other activity involving law enforcement.
Saturation patrols involve law enforcement deploying additional police officers to targeted roadways during select time periods to detect and apprehend impaired drivers.
Sobriety checkpoints are police stops, or checkpoints, where officers are set up on a roadway to randomly stop vehicles to check for impaired drivers. These are usually set up during times when impaired driving is known to happen, such as holiday weekends.
The Standard Field Sobriety Test (SFST) is a battery of 3 tests performed during a traffic stop in order to determine if a driver is over the legal Blood Alcohol Concentration or BAC limit. The 3 tests that make up the SFST are the horizontal gaze nystagmus (HGN), the walk-and-turn, and the one-leg stand tests. Developed in the 1970s, these tests are scientifically validated, and are admissible as evidence in court.
Passive alcohol sensors (PAS) are small electronic devices, usually built into police flashlights or clipboards that can detect alcohol in the ambient air of a vehicle. The sensors are quick, objective, and provide another source of detection to the officer which may aid in the identification of drunken drivers.
Hardcore drunken drivers (HCDD) are those individuals who have one or more previous drunken driving offense, or have a BAC of 0.15 mg/dL or more when stopped for an offense.