About Billy McNabb

Billy McNabb practices in San Marcos, Texas and has been defending and protecting the rights of citizens accused of crimes since 1995. His practice is dedicated to defending citizens with cases primarily in Hays County.


Frequent Lecturer

Over the course of his career, McNabb has lectured and educated thousands of attorneys and court personnel on subjects including expunction of arrest records, defense of DWI cases, Administrative License Revocation (ALR), blood testing, breath testing, and cross examination. McNabb has lectured several times this year on the topics of expunctions, Administrative License hearings, trial issues, and ethics.


San Marcos Daily Record BEST OF HAYS 2015 and 2016 Winner

It is an honor to serve the fine folks of this community and to have been voted the best attorney two years in a row.


Gas Chromatography Certifications

Gas Chromatography is the methodology by which the government tests blood alcohol concentration for DWI prosecutions. To further his understanding of this methodology and to better defend his clients, Mr. McNabb holds certifications in gas chromatography from a premiere laboratory training facility. The facility in which Mr. McNabb received his training and certifications trains some of the top governmental agencies, including the FBI, DEA, and CDC. Mr. McNabb strives to have a comprehensive education in order to best help his clients.


Texas DWI Lawyers - Board President

Texas DWI Lawyers is a nonprofit organization formed of the top Texas DWI Defense trial lawyers dedicated to defending those accused of DWI. The primary goal of the organization is to protect the rights of citizens charged with intoxication related offenses by providing the best DWI defense education for attorneys. Texas DWI Lawyers provides education to attorneys on all issues related to the defense of citizens accused of DWI.


Texas Criminal Defense Lawyers Association (TCDLA) DWI Resource Committee Member

The DWI Resource Committee is dedicated to promoting excellence in ALR and DWI defense through legislation, education, and informed representation pursuant to the U.S. and Texas Constitutions.


Texas Criminal Defense Lawyers Educational Institute (TCDLEI) Board Member

TCDLEI is an organization that works closely with TCDLA to provide better defense to citizens accused. TCDLEI is dedicated to use its resources within the general charitable and educational purposes, the specific and primary purpose of the institute is to promote and support the administration of justice in Texas, particularly through the continuing legal education of criminal defense lawyers and staff.


Contact Us

We can help.

Call 512-353-2136 or email info@billymcnabb.com



Everything discussed with my office is completely confidential. For your attorney to best represent you, it is critical that you be open and honest. You must feel confident in your attorney's ability and comfortable expressing your concerns.


Selecting an Attorney

Do not make a decision to hire a particular attorney based upon this, or any other advertisement. We encourage you to meet with several attorneys, and remember that you are a consumer, making the most important consumer decision of your life. As such, we would be glad to meet with you to discuss your legal situation.


Recent Lectures Include


13th Annual Stuart Kinard Memorial - Advanced DWI Seminar

November 2nd, 2017 - November 3rd, 2017

Topic - Ethics for DWI Lawyers



Texas District Court Alliance Workshop - Civil Case Progression

October 17th, 2017 - October 19th, 2017

Topic - Expunctions



DWI Defense - Lassoing Scientific Evidence and Taking Control at Trial

September 21st, 2017 - September 22nd, 2017

Topic - Administration License Revocation (ALR) and DWI Defense


Speaker and Course Director

Texas DWI Lawyers Annual Seminar

September 15th, 2016 - September 16th, 2016

Topic - Cross of the State’s Breath Test Expert



A CLE Series for the Young Lawyer

April 15th, 2016

Topic - Making the Most of an Administrative License Revocation Hearing (ALR)



DWI Defense 2016 - Immediate Courtroom Application

March 3rd, 2016

Topic - Cross Examination of the State’s Blood Expert



Life’s a Journey - Enjoy the Ride

County and District Clerk’s Association of Texas Education Roundup

January 18th, 2016 - January 21st, 2016

Topic - Occupational Licenses







How We Can Help

We have successfully defended hundreds of citizens accused of crimes.

We can help you with:

  • Drug Related Charges
  • Alcohol Related Charges
  • Probation Violations
  • Felonies and Misdemeanors
  • Expunctions

Find out more »


Billy McNabb
Attorney at Law

144 E. San Antonio Street
San Marcos, TX 78666

Telephone (512) 353-2136
Fax (512) 353-2137


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