Who Gets Tested
The FAA defines safety-sensitive employees under 14 CFR Part 120. For Part 135 charter operators, this includes pilots, flight engineers, flight attendants, aircraft dispatchers, maintenance personnel, and ground security coordinators. Anyone performing a safety-sensitive function must be enrolled in the company's testing program. Contractors performing safety-sensitive work (e.g., contract maintenance technicians) must also be covered, either under the operator's program or their own DOT-compliant program.
Part 91 owner-operators and their private pilots are generally not subject to FAA drug and alcohol testing requirements. The mandate applies specifically to Part 119 certificate holders operating under Part 121 or Part 135. This distinction is important: a pilot flying Part 91 for a corporate flight department may not be enrolled in a testing program, but the same pilot flying Part 135 charter must be.
Types of Testing
Pre-Employment Testing
Every safety-sensitive employee must pass a drug test before performing any safety-sensitive function. No exceptions. No conditional starts. The employee cannot touch an aircraft, dispatch a flight, or perform maintenance until the negative result is confirmed. Results typically take 24 to 72 hours. MRO (Medical Review Officer) review is mandatory before results are finalized.
Random Testing
The FAA mandates a minimum random drug testing rate of 50% of the safety-sensitive employee pool annually and a random alcohol testing rate of 10% annually. These rates are set by the FAA Administrator and can be adjusted based on industry-wide positive test rates. Random selections must be scientifically valid, meaning each employee has an equal probability of selection during each testing cycle. Selections are typically generated by third-party consortium administrators using computer-randomized algorithms.
Post-Accident Testing
Drug and alcohol testing is required following any accident that results in fatality, or when the operator receives an NTSB accident notification. Post-accident testing should occur as soon as practicable, within 8 hours for alcohol and 32 hours for drugs. If the testing window passes without a specimen being collected, the operator must document the reason and maintain that documentation.
Reasonable Suspicion Testing
A trained supervisor who observes behavior consistent with drug or alcohol use must require the employee to submit to testing. Reasonable suspicion observations must be documented in writing within 24 hours. Two trained supervisors are required for reasonable suspicion alcohol testing determinations. The supervisor training requirement is 60 minutes on drug indicators and 60 minutes on alcohol indicators.
Return-to-Duty and Follow-Up
An employee who tests positive must complete a SAP (Substance Abuse Professional) evaluation, comply with recommended treatment, pass a return-to-duty test, and submit to a minimum of 6 follow-up tests in the first 12 months following return to duty. Follow-up testing can extend up to 60 months. The SAP, not the employer, determines the treatment and follow-up requirements.
The DOT 5-Panel Drug Test
The DOT drug test is a 5-panel urine test. This is federal mandate. Operators cannot add or substitute panels. Hair testing, oral fluid testing, and expanded panels are not DOT-approved for Part 135 compliance. The specimen is split into primary and split specimens at the collection site. If the primary tests positive, the employee has 72 hours to request testing of the split specimen at a different SAMHSA-certified laboratory.
Marijuana is legal in many states. It is not legal under federal aviation regulation. A positive THC result on a DOT drug test carries the same consequences as a positive cocaine result, regardless of state cannabis laws or medical marijuana cards. The FAA does not recognize state exemptions.
