The Substance Abuse and Mental Health Services Administration (SAMHSA) requires all companies which use commercial class driver's licenses for employees to have an employee drug testing program for the following 5 specific categories of drugs: Cannabinoids, Cocaine, Amphetamines, Opiates and Phencyclidine. See SAMHSA 5 for more information.
Note: Please follow the links if you are looking for information regarding SAMHSA Laboratory or SAMHSA Confirmation.