Consider for a moment a variety of scenarios in which a substance abuser might affect your workplace:

Do certain employees perform key functions of the organizations?

	Brokers handling large sums of money
	Technicians monitoring essential equipment such as computers, nuclear power dials, etc.
	Salespersons representing the company

Do you have employees in positions where alcohol or other drug abuse would be difficult to detect?

	Employees who work at home
	Traveling salespersons
	Home health care workers

Do you have employees in "safety sensitive" jobs?

	Driving vehicles
	Operating machinery
	Managing a place of public entry such as a security checkpoint

Do you have employees in "security sensitive" jobs?

	Responsible for inventory or stock
	Responsible for ideas, products, plans, and proprietary material
	Responsible for financial accounting or cash
	Responsible for confidential documents

Source:

Making Your Workplace Drug Free: A Kit For Employers, Employer Tip Sheet #4, Drug Free Workplace Programs, Substance Abuse and Mental Health Services Administration (SAMHSA)