Clinical Science Laboratory, founded in 1974, is a privately held reference medical laboratory, specializing in the field of toxicology. It provides reference testing for private physicians, hospitals, criminal justice systems, counseling centers, halfway houses and medical clinics. It offers services, such as urine drug screening, meconium and blood testing, serum and gastric fluid testing, oral fluid, reference and medical testing, pre-employment and employment testing and wellness testing. It can also perform emergency analyses for potential ethylene glycol poisoning. The clinic also performs routine and esoteric diagnostic testing, including testing in immunology, steroids, DNA probe, hepatitis, pregnancy, and HIV and AIDS. Located in Mansfield, Mass., its testing procedures are certified by the Clinical Laboratory Improvement Act.