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Another criticism of standardized field sobriety tests is the statistical evidence behind them, and the ability of the test to actually judge for impairments related to alcohol. One study involved completely sober individuals who were asked to perform the standardized field sobriety tests, and their performances were videotaped.
An increasingly used field sobriety test involves having the suspect breathe into a small, handheld breath testing device. These are often referred to as PAS Tests, or "Preliminary Alcohol Screening" Tests", or a PBT, "Preliminary Breath Test" and precede the actual arrest and subsequent requirement to submit to an evidentiary chemical test of ...
By reason of his training and experience, a DRE undoubtedly possesses expertise on determining drug impairment that is outside the experience and knowledge of the trier of fact. He is thus an expert for the purpose of applying the 12 step evaluation and determining whether that evaluation indicates drug impairment.
Silva testified that he is trained in field sobriety testing. He said during his observations that night he noticed Flint had “bloodshot glassy eyes” with “droopy eyelids.”
Drug impaired drivers still show impairment during the battery of standardized field sobriety tests, but there are additional tests to help detect drug impaired driving. In the US, one study found that 25.8% of drivers seriously injured in crashes tested positive for cannabinoids, 13.6% tested positive solely for cannabinoids, and 24.6% tested ...
However, a driver is not legally obligated to submit to field sobriety tests, pre-arrest breath tests or cheek swabs at a DUI checkpoint, according to Shouse California Law Group.