• BAC - Breath Alcohol Content- Expressed as the numerical ration between milligrams of alcohol in a 100 milliliters of blood.

• Breathalyzer – A breath analysis device which produces an estimate of BAC based upon the chemical analysis of a breath sample. The technology has become outdated, with law enforcement agencies turning to more accurate testing devices. Many mistake new BAC measuring technology for Breathalyzers because of its previous popularity.

• DUI – Driving Under the Influence

• DWI – Driving While Intoxicated

• "Implied Consent" Law - Law in Washington DC, as well as other jurisdictions, where one is presumed to have consented to a chemical test if someone is suspected of violating a traffic alcohol law.

• Intoxilyzers - A breath analysis machine producing an estimate of BAC based on infrared spectroscopy.

• NHTSA – National Highway Traffic Safety Administration

• Notice of Proposed Suspension – A notice that the arresting officer must issue to alert you of the impending suspension of your driving privileges.

• OWI – Operating While Impaired.

• PBT – Preliminary Breath Test- a device that is portable in nature and is often carried by police to provide estimates of BAC. The results of a PBT are generally not admissible in trail.

• “Per se” DWI Charge – a DWI offense based on BAC without reference or proof of driving impairment.

Sobriety Testing Definitions

• Walk and Turn – A standardized field sobriety test that is administered by requiring the subject to walk heel-to-toe along a real or imaginary line, then turn and return in the same manner. Certain clues of impairment are looked for by law enforcement.

• One Leg Stand – A standardized field sobriety test that is administered by requiring a subject to stand on one leg and count to 30 by thousands. Certain clues of impairment are looked for by law enforcement.

• Horizontal Gaze Nystagmus (HGN) - An involuntary jerking of the eyeball intensified by alcohol consumption. Test is administered by law enforcement using a stimulus and requires a subject to track the stimulus with their eyes. Certain clues of impairment are looked for by law enforcement.