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Blood Alcohol Testing

Once a person is stopped for driving under the influence, law enforcement will ask that the person submit to a blood alcohol test. Blood alcohol tests are administered by law enforcement to determine the amount of ethyl alcohol that is in a person's bloodstream. The amount of alcohol in a person's blood stream is known as blood alcohol concentration (BAC).

In California, if a person has a BAC of 0.08% or higher, he/she is legally considered intoxicated. Blood alcohol testing is voluntary.

In many cases, the police officer may not inform the driver of his/her chemical testing rights. Seeing the blood alcohol test is voluntary, the person has the legal right to refuse to consent. However, refusing to submit to blood alcohol testing will lead to the automatic suspension of the person's license. Similarly, if a person has a BAC of 0.08% or higher, the officer will confiscate his/her driver's license. The person will then be given a temporary license, which will allow him/her to drive for up to 30 days after his/her arrest.

There are three types of tests law enforcement uses to determine a person's blood alcohol level. Blood alcohol can be measured by a person's breath, blood, or urine. Certain factors such as sex, gender, weight, type of alcohol consumed, food consumed, and amount of alcohol consumed will greatly impact the final results of the person's blood alcohol test.

Due to the fact that so many things can negatively impact a person's blood alcohol test results, it is always in the person's best interest to challenge his/her reported BAC level. One of the best things a person can do after being arrested for DUI and submitting to a blood alcohol test is to speak with a skilled DUI defense attorney. An attorney can contest the person's test results, find hidden errors, and investigate faulty conditions.

San Mateo DUI Defense Attorney

The Law Office of Robert Tayac has helped countless clients fight their San Mateo DUI charges. With years of trial and DUI litigation experience, Attorney Robert Tayac has the skill and legal expertise it takes to successfully contest his clients' DUI charges. Whether your are a first time offender or a multiple DUI offender, you can be assured that Mr. Tayac will put every effort into helping you avoid a criminal conviction.

Any person who drives under the influence of drugs and/or alcohol places his/her life and others in great danger. For this reason, California has adopted strict DUI laws and legal penalties. If a person is convicted of driving under the influence in San Mateo County, he/she faces life-altering legal punishments such as jail time, fines, probation, license suspension, and vehicle impoundment. When you are charged with DUI, you need the counsel of an experienced San Mateo attorney to increase your chances of winning in court.

Contact the Law Office of Robert Tayac for your free DUI 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

  • “Without Mr Tayac's knowledge and drive to succeed, I most likely would not be able to write this review today.”


  • “These clients have called me to thank me for referring them to the Law Offices of Robert Tayac.”

    R.R., Attorney at Law

  • “His in depth knowledge and expertise within his field, along with deep and lasting relationships with the District Attorneys office and everyone involved are without a doubt unmatched.”


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