Cocaine and Drug Tests: What Is Measured, and at What Level

What the laboratory actually measures

A cocaine test does not target cocaine. It targets benzoylecgonine, the metabolite the body produces as it breaks cocaine down. On the DOT urine panel the initial immunoassay screen is set at 150 ng/mL of benzoylecgonine, and the confirmatory test at 100 ng/mL Source 1eCFR49 CFR §40.85 (current text) — checked 17 Aug 2026.

Two numbers exist because two different techniques are answering two different questions. A sample above the screening cutoff is not a positive — it is a sample that now has to be confirmed by a second, more specific method Source 3eCFR49 CFR Part 40 — Procedures for Transportation Workplace Drug and Alcohol Testing Programs — checked 17 Aug 2026.

Where cocaine sits on the panels

Cocaine is on every federal panel. It was part of the original five-drug panel and it remains in both the DOT panel Source 1eCFR49 CFR §40.85 (current text) — checked 17 Aug 2026 and the HHS authorised panels for federal workplace testing Source 2HHSMandatory Guidelines for Federal Workplace Drug Testing Programs — Authorized Testing Panels — checked 17 Aug 2026. There is no federal programme that tests for drugs but leaves cocaine off.

Why we do not publish a detection window

Official sources set cutoffs, not durations. Neither DOT nor HHS publishes how long benzoylecgonine stays above a cutoff, because it depends on the individual, the dose, the pattern of use and the specimen. Any single number you see quoted has come from someone other than the agency that writes the rule.

The honest answer to “how long will it show” is that the cutoff is knowable and the timeline is not.

If a cocaine result is confirmed

A confirmed laboratory result goes to a medical review officer, whose job is to consider whether there is a legitimate medical explanation before the result is verified Source 3eCFR49 CFR Part 40 — Procedures for Transportation Workplace Drug and Alcohol Testing Programs — checked 17 Aug 2026. If you have any documented medical explanation, the verification interview is where it belongs, with the documentation in hand.

Federal (DOT): a verified positive removes you from safety-sensitive functions and starts the return-to-duty process.

Home tests and cocaine

Home cocaine tests are screening devices. The FDA's guidance on drugs-of-abuse home tests is that a preliminary positive needs laboratory confirmation before it means anything Source 4FDADrugs of Abuse Tests — checked 17 Aug 2026Source 5FDADrugs of Abuse Home Use Test — checked 17 Aug 2026. A line on a cassette is the start of a question, not an answer to it.