Amphetamines and Methamphetamine on a Drug Test

The numbers on the panel

On the DOT urine panel, amphetamine and methamphetamine share a single line: 500 ng/mL to screen, 250 ng/mL to confirm. MDMA and MDA sit on their own line carrying the same two numbers Source 1eCFR49 CFR §40.85 (current text) — checked 17 Aug 2026.

The same analytes appear in the HHS authorised panels used across federal workplace testing Source 3HHSMandatory Guidelines for Federal Workplace Drug Testing Programs — Authorized Testing Panels — checked 17 Aug 2026, so a federal employee and a regulated driver are measured against the same thresholds.

Prescribed stimulants are the ordinary case here

This is the analyte group where lawful prescriptions and testing collide most often. A prescribed stimulant does not become a different molecule because a doctor prescribed it. The laboratory measures what is in the specimen and reports it against the cutoff.

What resolves it is the medical review officer. Before a laboratory positive becomes a verified positive, the MRO considers whether there is a legitimate medical explanation Source 2eCFR49 CFR Part 40 — Procedures for Transportation Workplace Drug and Alcohol Testing Programs — checked 17 Aug 2026. That is the step where a prescription belongs — with documentation, at the interview, not afterwards.

What the laboratory does not know

The laboratory does not know your name, your medications or your job. It receives a specimen and a code. That separation is deliberate: measuring and interpreting are kept in different hands Source 2eCFR49 CFR Part 40 — Procedures for Transportation Workplace Drug and Alcohol Testing Programs — checked 17 Aug 2026.

It also means a laboratory positive is not an accusation. It is a measurement waiting for review.

Medication taken for a disability

Where a medication is taken for a disability, what an employer may ask and what it may do with the answer are constrained by the Americans with Disabilities Act, and the EEOC has published guidance on how substance use and treatment interact with those obligations Source 4EEOCSubstance Use and the ADA — checked 17 Aug 2026.

This is one of the places where federal employment law, DOT rules and state law all bear on the same facts and do not give one answer. Treat any single rule you read as partial.

Home tests for amphetamines

Home amphetamine tests are screening devices. A preliminary positive needs laboratory confirmation before it means anything Source 5FDADrugs of Abuse Home Use Test — checked 17 Aug 2026 — and a prescribed stimulant is precisely the situation in which an unconfirmed screen misleads the person holding it.