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What kind of tests does H.G.N. involve?

  1. Physical fitness tests

  2. Drug and alcohol detection tests

  3. Psychological evaluations

  4. Fire safety drills

The correct answer is: Drug and alcohol detection tests

The Horizontal Gaze Nystagmus (H.G.N.) test is specifically designed to detect signs of impairment due to alcohol consumption. During this test, a law enforcement officer checks for involuntary jerking of the eyes, which can indicate a blood alcohol concentration at or above a certain level. This test is a part of Standardized Field Sobriety Tests (SFST) used by police to assess whether a driver is under the influence of alcohol. While other options such as physical fitness tests, psychological evaluations, and fire safety drills serve different purposes within law enforcement training or operations, they do not relate to the specific assessment of intoxication that H.G.N. provides. Therefore, the focus on drug and alcohol detection confirms its relevance and importance in identifying impaired drivers during traffic stops.