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DUI Presumptions and Burdens of Proof

California Vehicle Code Section 23610

23610. (a) Upon the trial of any criminal action, or preliminary proceeding in a criminal action, arising out of acts alleged to have been committed by any person while driving a vehicle while under the influence of an alcoholic beverage in violation of subdivision (a) of Section 23152 or subdivision (a) of Section 23153, the amount of alcohol in the person's blood at the time of the test as shown by chemical analysis of that person's blood, breath, or urine shall give rise to the following presumptions affecting the burden of proof:

(1) If there was at that time less than 0.05 percent, by weight, of alcohol in the person's blood, it shall be presumed that the person was not under the influence of an alcoholic beverage at the time of the alleged offense.

(2) If there was at that time 0.05 percent or more but less than 0.08 percent, by weight, of alcohol in the person's blood, that fact shall not give rise to any presumption that the person was or was not under the influence of an alcoholic beverage, but the fact may be considered with other competent evidence in determining whether the person was under the influence of an alcoholic beverage at the time of the alleged offense.

(3) If there was at that time 0.08 percent or more, by weight, of alcohol in the person's blood, it shall be presumed that the person was under the influence of an alcoholic beverage at the time of the alleged offense.

(b) Percent, by weight, of alcohol in the person's blood shall be based upon grams of alcohol per 100 milliliters of blood or grams of alcohol per 210 liters of breath.

(c) This section shall not be construed as limiting the introduction of any other competent evidence bearing upon the question of whether the person ingested any alcoholic beverage or was under the influence of an alcoholic beverage at the time of the alleged offense.

Office Location and Areas We Serve

The Law Office of Robert Tayac is located in San Francisco at 505 Montgomery Street, 11th Floor San Francisco, California 94111. Satellite offices are maintained in Napa, Redwood City, San Rafael, and Walnut Creek.

For more information on driving under the influence matters in neighboring cities and counties, feel free to review the county specific information on the resource pages listed below:

  • San Francisco
  • Marin County
  • San Mateo County
  • Oakland
  • Walnut Creek
  • San Rafael
  • Alameda County
  • Contra Costa County
  • Napa
  • Palo Alto

Contact The Office

Robert Tayac and the DUI investigators and experts working with him have been helping people who have been arrested for driving under the influence in San Francisco and the surrounding counties for more than twenty years. If you hire the Law Office of Robert Tayac to handle your DUI case, you will know that you have retained the services of the most knowledgeable, experienced, and trustworthy San Francisco DUI defense team.

Contact the Law Office of Robert Tayac for your free case evaluation!

Why Choose Our Firm?

Attorney Robert Tayac Puts a Long, Decorated Career to Work for You
  • Puts Over 20 Years of Experience Toward Your Case

  • Specialized Education in DUI Defense

  • Has Trained Other Attorneys in San Francisco

  • Former San Francisco Police Officer & Police Inspector

  • Certified by the SFPD on the Intoxilyzer 5000 Testing Device

  • Co-Authored the 4th Edition of California Drunk Driving Defense

  • Boasts a Successful Record Achieving the Best Result for His Clients

  • Takes the Time to Understand You & Your Case

Client Testimonials

  • “I have no doubt that I engaged the best talent and proceeded in the best way throughout this.”

    C.Y.

  • “I sincerely appreciate both the work you did and your professionalism.”

    B.R.

  • “I did have to pay a fine and attend a 3 month school but I was able to maintain my license.”

    R.C.

  • “His guidance through the whole process during a difficult and emotional time was such a support. I highly recommend him. He is simply the best DUI attorney.”

    Former Client

  • “If you have a "must win," "zero sum" case and are willing to pay for his services, Robert Tayac may just be the very best DUI trial lawyer in Northern California.”

    N.D.

Contact Us Today

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