5 DOT Drug Testing Compliance Mistakes Motor Carriers Make

Paying for testing is not the same as having a well-managed DOT program. Employers remain responsible for compliance even when they use a service agent or C/TPA.^[1]

1. Treating random testing as a once-a-year task

For 2026, FMCSA's minimum random testing rates remain 50 percent for controlled substances and 10 percent for alcohol.^[2] Random testing also has timing and selection requirements. A program can have the right annual numbers and still create problems if administration is inconsistent.

2. Assuming a vendor owns the employer's compliance

DOT permits employers to use service agents, including C/TPAs, but the employer remains responsible for the applicable requirements.^[1] That makes vendor oversight, communication, records, and clearly assigned responsibilities important.

3. Missing Clearinghouse query obligations

Employers subject to Part 382 have Clearinghouse query responsibilities for covered drivers. Annual queries are tracked on a rolling 12-month basis.^[3] Query compliance should be treated as an ongoing employer obligation, not a one-time registration event.

4. Letting the written policy drift away from the program

FMCSA requires employers to provide drivers with educational materials and a written policy containing required information about controlled-substance use and alcohol misuse.^[4] A policy that no longer matches how the program operates can become a compliance problem.

5. Treating supervisor training as optional

Employers must provide the required reasonable-suspicion training to persons designated to supervise covered drivers. FMCSA describes a minimum of 60 minutes on alcohol misuse and 60 minutes on controlled-substance use.^[5]