To comply with Federal regulations, e.g., the Department of Transportation, Department of Defense, Nuclear Regulatory Commission, and the Department of Energy
	To comply with customer or contact requirements
	To comply with insurance carrier requirements
	To match other employer efforts, and to minimize the chance of hiring employees who may later be users or abusers
	To reinforce the company position on "no drug use"
	To identify current users and abusers and refer them for assistance
	To establish grounds for discipline or firing
	To improve safety
	To convince "casual users" that the cost of using is too high
	To deter "recreational" drug use that could lead to addiction
	To reduce the costs of alcohol and other drug abuse in the workplace
	To give recovering users another reason to stay sober (relapse prevention)

Source:

Making Your Workplace Drug Free: A Kit For Employers, Employer Tip Sheet #9, Drug Testing, Substance Abuse and Mental Health Services Administration (SAMHSA)