Evidence in New Jersey DWI Cases, Part 4: Field Sobriety Testing
In cases involving alleged driving while intoxicated (DWI) in New Jersey, prosecutors must prove all of the elements of the offense beyond a reasonable doubt. The New Jersey DWI statute states that a person commits an offense when they operate a vehicle “while under the influence” of drugs or alcohol. Prosecutors can prove this through testimony, such as by having the arresting officer testify about their observations of the defendant’s appearance or behavior, or through the defendant’s performance on field sobriety tests (FSTs). New Jersey evidence rules govern the ways prosecutors may introduce evidence of defendants’ performance on these tests at trial.
Accepted Field Sobriety TestsThe National Highway Traffic Safety Administration (NHTSA) has created standard procedures for three FSTs. New Jersey courts accept the use of two of the three tests in DWI investigations: the “One Leg Stand” and the “Walk and Turn”. HGN has not been held relaible to measure or check for intoxication, since there are 40 or more other causes of nystagmus in addition to intoxication.
– The “walk and turn” test involves taking nine heel-to-toe steps along a straight line, and then turning and taking nine heel-to-toe steps along the same line, back to the starting point. Officers look for whether the person maintains their balance, stays on the line, and maintains heel-to-toe contact.