DOT Drug Testing in Plain English
A DOT drug test is a federally regulated urine drug screen required for employees in safety-sensitive transportation roles. "DOT" stands for the Department of Transportation, and the testing is governed by 49 CFR Part 40 — a federal regulation that specifies exactly how collections must be performed, which substances are tested, who can perform collections, and how results must be reported.
Unlike a standard employer drug test (called "Non-DOT"), a DOT test is not flexible. You cannot change the panel, use a different collection method, or substitute your own procedures. The federal rules apply uniformly.
Who Is Required to Get DOT Drug Tests?
DOT drug testing applies to employees in safety-sensitive roles regulated by one of six DOT modal agencies:
- FMCSA — Federal Motor Carrier Safety Administration: CDL truck drivers, bus drivers, school bus drivers
- FAA — Federal Aviation Administration: Pilots, air traffic controllers, aircraft mechanics, flight crew members
- FRA — Federal Railroad Administration: Train operators, conductors, dispatchers
- FTA — Federal Transit Administration: Mass transit drivers, maintenance workers, controllers
- USCG — U.S. Coast Guard: Commercial maritime crew members
- PHMSA — Pipeline and Hazardous Materials Safety Administration: Pipeline operations and maintenance workers
Not sure if your employees require DOT testing? The most common trigger in San Diego is the CDL. If your employees hold a CDL and operate CMVs for your business, you almost certainly have FMCSA obligations.
What Does the DOT 5-Panel Test For?
The DOT drug test screens for five substance groups. This panel is federally mandated and cannot be modified:
- Marijuana (THC) — Cutoff: 50 ng/mL (initial screen), 15 ng/mL (confirmation)
- Cocaine — Including crack cocaine metabolites
- Opioids — Heroin, morphine, codeine, and synthetic opioids including hydrocodone, hydromorphone, oxycodone, oxymorphone
- Phencyclidine (PCP)
- Amphetamines — Amphetamine and methamphetamine, including MDMA (Ecstasy) and MDA
How Is a DOT Test Different from a Non-DOT Test?
The key differences: DOT tests must use a federal Chain of Custody Form (CCF), must be processed at a SAMHSA-certified laboratory, and all results must be reviewed by a certified Medical Review Officer (MRO) before being reported to the employer. Results from a DOT test cannot be reported directly from the lab to the employer — the MRO step is mandatory.
Non-DOT tests are more flexible — employers choose the panel, may use rapid on-site test kits for initial results, and can structure their program according to their own policy rather than federal regulations.
Mobile DOT Collections in San Diego
On Point Drug Testing performs DOT urine specimen collections throughout San Diego County. We come to your location with all required federal Chain of Custody Forms, maintain strict collection protocols, and ship specimens to SAMHSA-certified laboratories. Call 619-241-4415 to schedule or get a quote for your fleet.