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The 3 Types of Field Sobriety Tests Horizontal Gaze Nystagmus (HGN) Horizontal Gaze Nystagmus (HGN) is a type of involuntary bouncing or jerking of the eye that occurs. HGN becomes more prevalent when an individual is impaired by alcohol. Alcohol acts as a depressant on the nervous system, and this has an effect on the eye movements particularly in a sideways manner. Those exhibiting exaggerated eye bouncing and jerking don’t know realize it’s happening. This is part one of the three-part standardized field sobriety test, and has been shown to be accurate 83% of the time. The HGN is the most accurate of the three field sobriety tests. Walk and Turn The Walk and Turn tests the ability of the test taker to follow instructions and walk in a straight line. The test is broken up into two separate parts, instruction and performance. During Instruction, the Police Officer will demonstrate how the test is to performed. During the performance, the test taker will take nine heel-to-toe steps forward on a line, real or imaginary, pivot, and take nine steps back. This test only has an accuracy rate of 66%. One-Leg Stand The last test is the One-Leg Stand. Essentially, you just stand on one for 30 seconds and count out loud. Swaying back and forth, putting your foot down, hopping, or using arms to balance are all clues that Police Officers look for when determining intoxication.