Field sobriety tests (FSTs) are commonly used by law enforcement to assess a driver’s impairment during a traffic stop. While these tests are designed to detect intoxication, various factors unrelated to alcohol or drug use can lead to a failed test.
Here are several reasons you might not pass a field sobriety test, even if you haven’t been drinking.
Medical conditions
Certain medical conditions can impair balance, coordination, and cognitive function, all of which are key to passing a field sobriety test (FST). Conditions like inner ear disorders, vertigo or neurological issues such as multiple sclerosis can make it difficult to walk in a straight line or stand on one leg, which are key components of FSTs.
Physical injuries or disabilities
A previous injury or chronic condition affecting your legs, back or joints can make performing physical tasks during a sobriety test challenging. Even minor ailments like a sprained ankle or muscle stiffness could interfere with your ability to complete the test successfully.
Nervousness or anxiety
Being stopped by law enforcement can be a nerve-wracking experience. Anxiety may cause shaking, difficulty focusing or poor motor control. These symptoms can mimic those of intoxication and lead to a failed sobriety test even if you’re completely sober.
Environmental factors
The environment where the sobriety test is conducted can also play a role. Uneven pavement, poor lighting or adverse weather conditions like rain or wind may affect your ability to perform well on the test.
Fatigue
Driving while exhausted can impair motor skills and focus, making it hard to pass a sobriety test. Fatigue can also slow reaction time, impair coordination and affect one’s ability to follow instructions accurately.