One Source Toxicology, founded in 1999, is a privately held, full-service, certified laboratory that provides employment-based drug and alcohol testing solutions for clients in the public and private industries. The laboratory was formed by a merger between The University of Texas SAMHSA Laboratory and Employer Support Services. It provides substance abuse urinalysis screening solutions. One Source Toxicology also offers shipping services for urine collection supplies. The laboratory provides on-site sample collection, courier and Internet reporting solutions. In addition, it offers forensic urine collectors with cups, security seals and collection instructions. One Source Toxicology is a wholly-owned subsidiary of Employer Support Services.