The PAS DUI breath test: What legal authority does Law Enforcement have to use it?
A lot of clients ask me if it was "legal" for the law enforcement officer(s) to perform a pre-arrest breath test with a Preliminary Alcohol Screening Test Device aka "PAS" machine.
The answer is yes according to the California Vehicle Code. CVC Section 23612(h) allows for a law enforcement officer to use a "preliminary alcohol screening test" as an additional Field Sobriety Test and investigatory tool to use in a DUI investigation. The law enforcement officers are specifically allowed to use this when the suspect that a person was driving a motor vehicle while they were in violation of California Vehicle Code sections 23140 (a person under 21 driving under the influence of alcohol), 23152 (the common misdemeanor criminal violation for DUI for person over age 21) or 23153 (driving under the influence of alcohol or drugs causing injury). This test is used to show the "presence of concentration of alcohol" as determined by a sample of a suspect's captured breath.
Another follow up question to this is why this tool is even necessary if law enforcement has the other FST tests and they observed "bad driving" or an accident. Basically it is a "further investigative tool," and helps the law enforcement officer to form reasonable casue to believe that an individual has been operating a motor vehicle under the influence of alcohol or drugs. A PAS test is not always given to a suspect in a DUI investigation due to a refusal to submit to this pre-arrest breath test, conditions that don't allow for its use or the officer's decision not to perform this test. Because it is an additional tool, it is not required to be given to everyone suspected of a DUI offense.

