The United States Department of Transportation (U.S. DOT) publishes rules and regulations in the Federal Register.  However, the U.S. Department of Transportation's website is a good place to start for information on rules, regulations, and other transportation related policies.  The actual rules related to drug and alcohol testing are covered under 49 CFR Part 40.
In addition, Intoximeters offers a variety of training courses specific to workplace testing.  The Training Department conducts classes regularly at our St. Louis, Missouri office as well as select regional locations around the United States.  Intoximeters workplace training classes are designed to meet the requirements of the U.S. Department of Transportation alcohol testing program as well as non-regulated company policy programs.
Courses also cover testing under other regulatory agencies such as the Nuclear Regulatory Commission, the U.S. Department of Energy, and U.S. Coast Guard.  Additional information on Intoximeters training courses can be found by clicking here.