Psychemedics provides hair-based drug testing services to employers, schools, and parents. Unlike urine tests, which detect drug use over just a few days, a standard hair sample from Psychemedics covers roughly three months of drug use history, making it harder to defeat through temporary abstinence or sample adulteration. Psychemedics' core technology is a patented method that digests hair to extract drug residues, uses a proprietary enzyme immunoassay screen developed in-house, and confirms results via mass spectrometry. Psychemedics is the only hair testing lab that manufactures its own screening assays. The company charges a per-test fee slightly above comparable urine tests, arguing the premium is justified by superior detection rates. Customers are primarily private-sector employers, served through a direct sales force, partners, and distributors. Psychemedics also sells a direct-to-consumer home testing kit online. Revenue is almost entirely domestic. The company operates out of a single laboratory in Culver City, California, with approximately 101 employees. In late 2024, Psychemedics completed a transaction to cash out small shareholders and filed to delist and deregister its stock, transitioning to a private operating structure after its final annual SEC filing.