About A & D Tests, Inc.


Founder Judy Williamson

A&D Tests was established in 1991 by Judy Williamson. While working for a SAMHSA certified laboratory, Ms. Williamson identified two critical needs for drug testing in the workplace: too many specimens were being ruled fatal flaws by laboratories because they were submitted as medical specimens without legally defensible documentation and employers wanted more comprehensive drug testing but were critical of the cost due to time away from the workplace to facilitate the collection process. With these needs in mind, Alcohol & Drug Tests, later changed to A&D Tests, was established as a small woman-owned business dedicated to forensic specimen collection and 24/7 mobile service.  

Today, A & D Tests has four convenient walk-in facilities in Texas with future plans for more locations. We work with local businesses, schools, city governments, and federal programs to offer fast and confidential service for all needs without the hassle of appointments. At A&D Tests, our team is highly experienced in the field of developing, implementing and administering all types of drug or alcohol plans and policies for any company or school requirement. We offer DOT random consortium services to keep your business compliant and on the road.

A&D Tests has been servicing our communities for more than three decades. We are proud of the relationships made with our customers and continue to strive to perfect our processes and maintain our customer loyalty. A&D Tests would like the opportunity of serving you for your drug and alcohol testing needs.

Contact us today for a quote at 888-845-8378