DOT Drug Testing done to the letter of Part 40.

What a compliant DOT drug test actually requires

A DOT drug test is not a lab result. It is a documented chain of events — a valid reason for testing, a certified collector, an unbroken chain-of-custody form, a SAMHSA-certified laboratory, a qualified Medical Review Officer, and a record you can produce years later when an investigator asks for it. Break any link and the test does not count, no matter what the lab reported.

That is the part most carriers get wrong. We have seen fleets with a clean testing history fail an audit because the CCF copies were never retained, or because a supervisor ordered a "random" test on a hunch. IPS Drug Testing exists to make sure every link holds.

Which agency rules apply to you

Part 40 is the procedural rulebook shared by every DOT agency. Your operating rule — who gets tested, how often, and what happens after a violation — comes from your modal agency:

IPS administers testing programs under all five. If you run a mixed operation — a trucking fleet with a pipeline division, or transit with a maintenance arm — you get one administrator, one portal and one point of contact instead of three vendors who each blame the others.

The six DOT testing reasons

Under DOT rules you may only test for a listed reason, and each one has its own documentation trail:

1. Pre-employment — a verified negative before the employee first performs a safety-sensitive function.
2. Random — unannounced selections spread reasonably through the year from a scientifically valid random pool.
3. Post-accident — alcohol testing within 8 hours and drug testing within 32 hours when the accident meets the criteria.
4. Reasonable suspicion — ordered by a supervisor trained in the required 60 minutes of drug and alcohol signs and symptoms, based on contemporaneous observation.
5. Return-to-duty — directly observed, only after a Substance Abuse Professional releases the employee.
6. Follow-up — a confidential SAP-directed schedule of at least six directly observed tests in the first 12 months.

What is on the DOT panel

The federal panel is a five-class urine test screened by immunoassay and confirmed by GC/MS or LC-MS/MS on every non-negative:

• Marijuana metabolites (THCA) — and no, a state medical or recreational card is not a valid medical explanation under DOT rules.
• Cocaine metabolites
• Opioids — codeine, morphine, heroin metabolite (6-AM), hydrocodone, hydromorphone, oxycodone and oxymorphone.
• Amphetamines — amphetamine, methamphetamine, MDMA and MDA.
• Phencyclidine (PCP)

Specimens are also checked for validity — creatinine, pH and oxidising adulterants — so dilute, substituted and adulterated samples are caught and handled under the correct Part 40 procedure rather than quietly passed through.

How fast you actually get results

A straightforward negative is typically MRO-verified and posted to your portal within 24 hours of the specimen reaching the lab, and non-negatives within 24–48 hours once the MRO has completed the donor interview. You are notified the moment a result lands — you never have to call and ask.

For pre-employment testing, that difference is money. A driver who sits idle for four days waiting on a result is a driver your competitor is hiring.