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A&D Tests, Inc. is a woman-owned business established in 1991 by Judy Williamson, dedicated to forensic specimen collection and 24/7 mobile service. It operates four walk-in facilities in Texas serving Central Texas and surrounding areas, working with local businesses, schools, city governments, and federal programs to provide fast, confidential drug and alcohol testing without appointments.

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Abbott Toxicology provides drug and alcohol testing solutions, including laboratory drug testing services, rapid point-of-care screening devices, and drug test result reporting systems. The company states it has 30+ years of experience and operates multiple toxicology laboratories worldwide, performing laboratory services for all 50 states and internationally.

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DATCS (Drug and Alcohol Testing Compliance Services) provides drug and alcohol testing, DOT compliance, background checks, DNA testing, and related screening services to businesses and schools nationwide. Based in Longview, TX, with collection sites across the United States, the company has been leading the industry since 1989 and offers expert training courses.

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ExpressCare Labs is a walk-in lab testing provider in Phoenix, AZ offering direct-access diagnostic and occupational health testing. It provides self-pay lab testing without insurance or a prior doctor's order for eligible tests, with results typically in 24 to 72 hours. The company is CLIA-certified, an FMCSA-registered C/TPA, and serves individual patients, employers, and referral partners.

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