Police Evidence in Drunk Driving

    1. Driving Symptoms: May include weaving in-and-out of lanes and reckless driving. Make sure to visit the National Highway Traffic Safety Administration for a list of indicators.
    2. Appearance and Behavior: Personal behavior and appearance play a major role in this category. Alcohol on the breath, thick and/or slurred speech, flushed face, etc.
    3. Field Sobriety Tests: Alphabet recitation, horizontal gaze nystagmus (following an object such as a pen or finger from side-to-side with your eyes), fingers-to-thumb, hand pat, etc. Federal studies have shown that only three tests are effective in detecting intoxication: walk-and-turn, one-leg-stand, and nystagmus. Other tests have been disapproved and deemed unreliable. As a result, three standardized field sobriety tests have been recommended and are being adopted by police agencies across the country. In California, however, police officers continue to administer tests of their choosing. Contrary to popular belief, the tests are not required; you may refuse to take them with no legal consequences.
    4. Incriminating Statements: Miranda warning do not need to be given until after the arrest has been made. The officer is free to ask incriminating questions, prior to arrest, during their initial investigation.
    5. Blood Alcohol Test: The test involves a choice of either a breath or blood. Note: the Preliminary Alcohol Screening (PAS) units, also called Evidential Portable Alcohol Systems (EPAS), are often given as part of the field sobriety tests, but not legally required (unless you are under 21 years of age) until after an arrest.

For more information, please visit the firm’s website section on DUI evidence or the Drunk Driving Law Center.

Back to Top

Offices Located In


  • Rancho Cucamonga 8608 Utica Avenue, Suite 220, Rancho Cucamonga, CA 91730 909.689.4515
  • Huntington Beach 16152 Beach Blvd, Suite 280, Huntington Beach, CA 92647 562.989.4774
  • Irvine 19800 Macarthur Boulevard #300, Irvine, CA 92612 949.752.1550
  • Long Beach 3780 Kilroy Airport Way #200, Long Beach, CA 90806 562.989.4774
  • Riverside 7121 Magnolia Avenue Suite H, Riverside, CA 92504 951.369.4999
  • Orange 1045 West Katella Avenue #350, Orange, CA 92867 714.716.2589
  • Torrance 21515 Hawthorne Boulevard Suite 200, Torrance, CA 90503 424.271.0490
  • Beverly Hills 468 N. Camden Drive, Second Floor, La Colonade Building, Beverly Hills, CA 90210 310.746.1960

Call or email the Firm’s founder, Lawrence Taylor, or our Managing Attorney, Chris Taylor, for a free consultation.