Preliminary Alcohol Screening (PAS) Devices
Unlocking the PAS Test:
Encountering the flashing lights of a police officer in a DUI scenario often involves a series of field sobriety tests, among which is the Preliminary Alcohol Screening (PAS) device[i]. Before an official DUI arrest, officers administer the PAS test by having individuals exhale into a tube connected to a portable device. It specifically gauges the presence of alcohol, excluding drug detection. After a steady exhale, the digital display reveals an estimated Blood Alcohol Content (BAC), providing the officer with additional grounds for a DUI arrest.
The Science Behind PAS:
A PAS device[ii] functions by measuring the ethanol (alcohol) content in the exhaled air. As alcohol is absorbed into the bloodstream from the stomach and intestines, a portion of it passes through the membranes of the lungs’ alveoli into the air. The concentration in the air correlates with the blood alcohol concentration at a ratio of 2100:1[iii].
Consent Dilemma:
In Los Angeles or Pasadena, consenting to a PAS test is generally voluntary for drivers detained in a DUI scenario[iv]. However, the officer is obligated to inform individuals of their right to refuse the PAS test before its administration[v]. Although voluntary, blowing into the PAS device doesn’t absolve individuals from providing breath, blood, or urine samples after a DUI arrest in Los Angeles or Pasadena.
Admissibility of PAS Results:
The numerical readings from the PAS device post-DUI arrest are likely admissible at the DMV admin per se (“APS”) hearing if provided by the officer. In a felony or misdemeanor DUI trial, admissibility depends on meeting foundational requirements by the Los Angeles District Attorney or Pasadena City Prosecutor[vi].
Strategic Defense by THE LEVENTHAL FIRM:
Specialized DUI attorneys, such as those at THE LEVENTHAL FIRM, possess the expertise to raise objections strategically, limiting the use of PAS readings, showcasing the device’s unreliability, and at times preventing PAS results from reaching the jury[vii]. The firm’s criminal defense lawyers are well-versed in both State and Federal regulations governing the maintenance and use of PAS devices in Los Angeles and Pasadena, ensuring the most robust DUI defense. For comprehensive insights into PAS tests, breath tests, blood tests, or any chemical test related to a DUI arrest in Los Angeles or Pasadena, contact our DUI experts.
Reference List:
[i] Cal VC 23612(h)
[ii] The Alco-Sensor IV is a common PAS device model used by Pasadena and Los Angeles DUI police. Various online retailers and pharmacies offer PAS devices for public purchase.
[iii] For a detailed scientific explanation, see [link to scientific paper]
[iv] Exceptions: If you are under 21 or on probation for DUI, you MUST consent to the PAS test. (See Cal VC 23136(c)(1) and Cal VC 23154)
[v] Cal VC 23612(i)
[vi] People v. Bury (1996) 41 Cal.App.4th 1194
[vii] For example, hearsay and due process issues frequently arise when California DUI officers fail to preserve the PAS device printouts.