Drug Test

A pre-employment or ongoing workplace screening that tests for the presence of controlled substances — policies and legality vary significantly by state and industry.

Drug testing in employment involves screening for controlled substances — most commonly marijuana, cocaine, opiates, amphetamines, and PCP — through urine, hair, saliva, or blood samples. Pre-employment drug testing is the most common form: candidates are required to pass a drug screen before their start date as a condition of the job offer. Ongoing random testing, post-accident testing, and reasonable-suspicion testing are also used, particularly in safety-sensitive industries like transportation, healthcare, construction, and manufacturing.

The legal landscape for workplace drug testing has shifted significantly with marijuana legalization. As of 2024, over 40 states have legalized medical or recreational marijuana, and several states (including New York, New Jersey, California, and Washington) prohibit employers from taking adverse action based on off-duty marijuana use. Federal contractors and safety-sensitive roles regulated by the Department of Transportation (DOT) are still subject to federal drug testing rules that treat marijuana as illegal regardless of state law. Employers must navigate this patchwork carefully.

Your Rights Around Drug Testing

  • Employers must generally disclose drug testing policies before testing — check your offer letter and employee handbook.
  • You can ask what substances are being tested for and what the threshold levels are.
  • Prescription medications can cause positive results — you have the right to disclose prescriptions to the medical review officer (MRO) before results are reported.
  • In states with marijuana protections, off-duty use may be protected — know your state's rules.
  • Refusing a drug test is typically treated the same as a positive result.
  • DOT-regulated positions (truck drivers, pilots, etc.) are subject to federal rules regardless of state marijuana laws.

Example

A candidate receives a conditional offer for a warehouse role. The offer letter states that employment is contingent on passing a pre-employment drug screen within 48 hours. She completes a urine test at an approved lab. Results come back negative and her start date is confirmed.