Psychemedics Corporation provides testing services for the detection of abused substances through the analysis of hair samples. The Company�s testing methods utilize a technology to enzymatically dissolve hair samples and then perform radioimmunoyassays on the hair sampled, with confirmation testing by mass spectrometry. Its primary application of its technology is as a testing service that analyzes hair samples for the presence of certain drugs of abuse. Its tests provide quantitative information that can indicate the approximate amount of drug ingested, as well as historical data, which can show a pattern of individual drug use over a longer period of time providing superior detection compared to other types of drug testing. It provides commercial testing and confirmation by mass spectrometry using industry-accepted practices for cocaine, marijuana, phencyclidine (PCP), methamphetamine and opiates. Testing services are performed at its laboratory in Culver City, California.