Federal regulations require every CDL driver to pass a DOT pre-employment drug screen before performing safety-sensitive work for a new employer. The test is administered by the carrier (typically at orientation) and the results are reported to the FMCSA Drug & Alcohol Clearinghouse.
What's tested
The DOT 5-panel urinalysis screens for: marijuana metabolites; cocaine metabolites; amphetamines (including methamphetamine and MDMA); opioids (including codeine, morphine, heroin, oxycodone, hydrocodone, hydromorphone, oxymorphone); and phencyclidine (PCP). Cutoff levels are federally specified — for example, marijuana metabolite cutoff is 50 ng/mL on initial screen and 15 ng/mL on confirmation by GC/MS.
Marijuana — legal in your state, illegal for CDL
Marijuana use is illegal under federal law regardless of state legalization. A positive marijuana test results in immediate Clearinghouse reporting, removal from safety-sensitive duties, and a mandatory return-to-duty process before you can drive again. State medical-marijuana cards do not provide a defense.
Prescription medications
Prescription opioids, amphetamines (Adderall, Vyvanse), and certain other Schedule II medications can trigger a positive screen. The Medical Review Officer (MRO) who reviews your test will contact you to verify any positive result with prescription documentation. A valid prescription generally allows the result to be reported as negative — but the carrier may still decline to put you in safety-sensitive service depending on the medication.
What to do before your test
Bring a complete list of all current prescriptions including dose and prescribing physician. Disclose any medications when asked. Do not refuse the test — refusal is treated as a positive result. Do not attempt to dilute or substitute the sample — modern collection protocols catch both, and adulterated samples are reported to the Clearinghouse.
If you fail
You'll be removed from safety-sensitive work immediately. To return to driving, you must complete a Substance Abuse Professional (SAP) evaluation and an SAP-prescribed treatment program, then pass a DOT return-to-duty test. The full process typically takes 60 to 180 days and costs $400 to $1,500. Read our Clearinghouse guide.