Psychemedics Corporation is a diagnostic services company specializing in the development and delivery of non-invasive hair-based drug and alcohol testing services. Founded in 1986 and headquartered in Acton, Massachusetts, the company maintains its primary College of American Pathologists (CAP) accredited and CLIA-certified laboratory testing facility in Culver City, California, serving corporate employers, government and law enforcement entities, financial institutions, educational organizations, and retail consumers across the United States and international markets, including Brazil. Psychemedics Corporation provides toxicological testing solutions based on a patented digestion method that extracts entrapped drug molecules from hair keratin for immunoassay screening and mass spectrometry confirmation (LC/MS/MS and GC/MS/MS). The company's core offerings include standard 5-panel hair drug assays detecting cocaine, marijuana, phencyclidine (PCP), amphetamines, and opiates; expanded multi-drug testing panels covering fentanyl, synthetic opioids, nitazenes, benzodiazepines, and prescription stimulants; Ethyl Glucuronide (EtG) hair testing for monitoring approximately 90-day alcohol consumption patterns; PDT-90 patented home-collection drug testing kits designed for consumer and parental use; customized sample collection kits; specialized workforce analytics tools including Quartile Reporting; and forensic expert consultation and legal testimony services. In recent corporate developments, Psychemedics completed a strategic capital restructuring in December 2024, voluntarily delisting its common stock from the Nasdaq Capital Market and deregistering under the Securities Exchange Act of 1934 to transition its shares to the OTC Markets under the ticker PMDI, a transaction executed alongside a reverse-forward stock split and a major equity financing agreement with 3K Limited Partnership and director Peter Kamin. The company has also expanded its risk-intelligence and data solutions by rolling out enhanced analytics platforms and publishing dedicated workforce and transportation drug monitoring reports tracking synthetic drug and multi-substance abuse trends.