Psychemedics Corporation provides testing services for the detection of drugs of abuse through the analysis of hair samples in the United States, Brazil, and internationally. The company offers screening and confirmation by mass spectrometry using industry-accepted practices for cocaine, marijuana, PCP, amphetamines, opiates, synthetic cannabinoids, and benzodiazepines. Its testing results provide quantitative information that can indicate the approximate amount of drug ingested, as well as historical data that can show a pattern of individual drug use over a longer period-of-time. The company provides its services to employers for applicant and employee testing; and treatment professionals, law enforcement agencies, school administrators, and parents concerned about their children's drug use. Psychemedics Corporation was founded in 1986 and is headquartered in Acton, Massachusetts.