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One of the most dangerous Field Sobriety Tests is the Preliminary Alcohol Screening test, also called the PAS test. This is a portable breath test to determine the presence of alcohol. The officer is supposed to advise the suspect that the test is voluntary. Many times, they do not.
This study was the first significant assessment of the workability of the tests under actual enforcement conditions. Further, this study was the first that standardized objective clues and scoring criteria were defined for the tests thereby validating standardized field sobriety testing.