Being pulled over on suspicion of drunk driving is never a fun experience. Typically, police officers ask a series of questions to drivers suspected of driving under the influence, including “Have you had anything to drink tonight?” Regardless of the answer, the officer may ask the subject to perform a series of field sobriety tests. These tests are intended to assess a person’s intoxication level. However, medical problems, injuries, and even obesity can prevent a person from completing field sobriety tests accurately.
What Are Field Sobriety Tests?
Field sobriety tests are physical actions that a person suspected of driving under the influence may be asked to perform. The National Highway Traffic Safety Administration (NHTSA) recognizes a battery of three different tests as “Standardized Field Sobriety Tests” or “SFSTs.” One requires the person to stand on one foot without falling over or putting the other foot down. Another requires the person to visually follow a moving object while the officer assesses the driver for signs of “horizontal gaze nystagmus,” an involuntary eye movement indicative of intoxication. The third test requires the driver to walk heel-to-toe along a straight line while counting steps, then to turn and walk back along the same line to the starting point.
In some cases, officers will deviate from the SFSTs and ask the drivers to recite the alphabet or count numbers backwards to assess their cognitive functioning. These types of tests have even lower degrees of reliability as evidence in DUI cases.
...