Below are some helpful links.

SAMHSA.GOV (Substance Abuse & Mental Health Services Administration)

SAMHSA store (many free publications)

National Institute on Drug Abuse

White House Office of National Drug Control Policy

Drugs: Shatter the Myths (free pdf)

Marijuana: Facts Parents Need to Know (free pdf)

DOT Office Drug & Alcohol Policy Overview (49 CFR part 40)

DOT Agency Information (website links to DOT agencies & lists their random rates)

Drug-Free Workplace Advisor (Dept of Labor program will customize a comprehensive drug screen employment policy)