Experienced DUI Defense Attorney Contact Us Today to Move Forward with Your Case

Expert Profiles

Alan McCann

Alan McCann has 33 years of experience as a member of the San Francisco Police Department, and more than undefinedten years of experience as an investigator. Trained in accident investigation and reconstruction, Mr. McCann has conducted over 1,000 DUI investigations and made over 600 DUI arrests.

Mr. McCann holds basic, intermediate, and advanced POST (Peace Officer's Standards and Training) Certificates. He was also awarded the San Francisco Police Department's highest honor, the Gold Medal of Valor.

Halle Weingartenundefined

Halle Weingarten is a forensic toxicologist. She was a member of the Santa Clara County Crime Laboratory where she headed the DUI breath alcohol testing program.

Ms. Weingarten has trained police officers in the use of breath testing instruments used in DUI investigations and was responsible for maintaining the devices used in Santa Clara County.

She has qualified as an expert in driving under the influence cases in California Superior Courts and articles she has written have been published in scientific journals. As well, Ms. Weingarten has lectured to other scientists on matters related to forensic toxicology.

Paul Cavalleroundefined

Investigator Paul Cavallero has conducted over 200 DUI investigations and regularly testifies in court as a witness on behalf of our clients. As a member of our firm for over 7 years, he is responsible for gathering client discovery, filing and serving client motions in all Bay Area county courthouses, and photographing areas where clients' were stopped by police officers.

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

  • “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.”


  • “Co-Author of the "first word" in DUI Defense law in this state...”

    D.C., Attorney at Law

  • “Thank you again Robert, and we are just hoping that we can move on and 'let it go'.”


  • “...thank you for walking me through this process and making me feel at ease.”


Informational Videos

  • The Law Office of Robert Tayac

    Attorney Robert Tayac talks about the firm's experience handling DUI related cases.

  • The Accuracy of Breath Test Machines

    Attorney Robert Tayac talks about breath test machines and how to determine if they are accurate.

  • Field Sobriety Tests

    Mr. Tayac discusses the two types of field sobriety tests and what you should do if you are asked to perform one.

Contact Us Today

Your Strong Defense Starts with a Case Evaluation
  • Please enter your name.
  • This isn't a valid phone number.
  • Please enter your email address.
    This isn't a valid email address.
  • Please make a selection.
  • Please enter a message.