Nationwide Drug Testing, LLC
PO Box 760, Skippack, PA 19474

​Phone: (610) 615-5192
Fax:  (610) 615-5199 

49 CFR Part 40 details drug and alcohol testing for organizations within the transportation industry. An
overview and the document’s entirety can be viewed on the Department of Transportation’s website at:

Types of Testing:

    • Pre-Employment: Before a prospective employee can perform a safety sensitive function or be

      included in a consortium, the employer must receive a negative test result.
    • Reasonable Suspicion/Cause: If a trained supervisor has reason to believe that an employee

      has violated the DOT policy on drugs and alcohol, the employee must submit to testing.
    • Random: The DOT requires safety sensitive employees be tested for drugs at a rate of 50% annually.
      Selections are made monthly by a computer program and the designated employer representatives are
      notified via a letter.
    • Return to Duty: After testing positive, an employee must re-test before returning to safety

      sensitive functions.
    • Follow-Up: A testing program set up by a substance abuse professional to help an employee resolve    

      drug use associated problems, usually done over the course of 12 months.
    • Post Accident: Testing will include both drugs and alcohol if certain criteria are met.

If an Employee Tests Positive or Refuses a Test:

    • The employer is required to remove the employee immediately from safety-sensitive functions and that
      employee cannot return to DOT safety-sensitive functions until evaluated by a Substance Abuse
      Professional (SAP) and treatment is completed. A follow up evaluation must also be completed along
      with a negative drug/alcohol test. The employee will also be subject to follow up testing over the

      course of 12 months under direct observation.

A link to this portion of the DOT site, can be found here: http://www.dot.gov/odapc/employee#violate 

Useful Links:

Office of Drug and Alcohol Policy & Compliance: 
National Institute on Drug Abuse: 
National Institute on Alcohol Abuse and Alcoholism: 
Substance Abuse Program Administrators Association: