A study conducted by scientists at Clemson University involved showing police officers videotapes of individuals taking six common field sobriety tests. The officers were asked to decide whether suspects were too intoxicated to drive legally. Unknown to the officers, none of the suspects had a BAC above .000. They had zero alcohol in their blood. However, in the professional opinion of the officers, 46% of the completely sober individuals were too drunk to drive! Therefore, use of field sobriety tests led to judgments by law enforcement officers that were about as accurate as flipping a coin.
And not quite as relevant to my situation, but still very interesting:
The human body produces its own supply of alcohol naturally on a continuous basis, 24 hours a day, seven days a week. It’s called endogenous ethanol production. Therefore, we always have alcohol in our bodies and in some cases people produce enough to become legally intoxicated and arrested for DUI