For job seekers

Drug testing for a job: what is tested, how long drugs show up, and your rights

Many employers test applicants for drugs, and the rules depend on the job and the state. Here is what a test looks for, how the process works, what happens if a result comes back positive, and the rights you have at each step.

Reviewed Oct 24, 2026
Primary sources
Free · Not legal advice

On this page

Short version
What’s tested
Process
If positive
Marijuana
DOT jobs
By state
Questions
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The short version

An employer can usually test you before or after a job offer. Federal law allows it; some states allow it only after an offer or set other limits.
Tell the tester about prescriptions. A Medical Review Officer, a doctor, calls you before your employer hears about a non-negative result. That call is your chance to explain.
You can ask for your second sample to be tested. In DOT and federal-standard tests you have 72 hours from the doctor’s call.
If a screening company reports the result, you usually get a warning first. Before the employer acts on that report, it must send you a copy and a summary of your rights.
Marijuana depends on the job and the state. DOT jobs always test for it. Some states protect off-duty use or medical patients.

What a test looks for, and how far back

Detection times are rough guides from SAMHSA’s 2012 clinical guide. Your result depends on you, how much and how often you used, and the test’s cutoff.

‘5-panel’ and ’10-panel’ tests. A ‘5-panel’ test usually means the five drug groups federal programs first tested for: amphetamines, cocaine, marijuana, opiates and PCP. What a ’10-panel’ covers depends on the lab, so ask for its list. SAMHSA TAP 32, Clinical Drug Testing in Primary Care (2012), ch. 1, Workplace Drug Testing
Urine: detection window. Most drugs show in urine for about 2 to 4 days after use, per a 2012 federal clinical guide, but some show for weeks. No one can give you an exact number. SAMHSA TAP 32 (2012), ch. 2 SAMHSA TAP 32, ch. 5
Urine detection windows by drug (SAMHSA TAP 32 estimates). Rough guides only: marijuana can show for days to a month or more with heavy daily use; cocaine and most opioids for a few days. Your result depends on you, the amount, and the test cutoff. TAP 32, ch. 5, Marijuana/Cannabis TAP 32, ch. 5, Marijuana/Cannabis
Oral fluid (saliva): detection window. A mouth swab test mostly shows use in the last day or two. SAMHSA TAP 32, ch. 3, Oral Fluid SAMHSA TAP 32, ch. 3
Hair: detection window. A hair test usually looks back about 3 months and does not show use in the last week or so. It is better at finding repeated use than one-time use. SAMHSA TAP 32, ch. 3, Hair TAP 32, Exhibit 2-1 footnote
Blood: detection window. A blood test shows only fairly recent use. SAMHSA TAP 32, ch. 3, Blood

How the process works

ADA timing: pre-offer vs post-offer. Before an offer, an employer may test you for illegal drugs but may not ask about your medications. After an offer, it may ask more, but must treat everyone in the job the same and keep it confidential. EEOC Preemployment Guidance, 'The Post-Offer Stage' EEOC Preemployment Guidance, 'What is a Disability-Related Question?'
ADA: alcohol tests and workplace alcohol rules. An employer cannot give you an alcohol test before a job offer under the ADA. After an offer, it can if it tests everyone in that job. EEOC Preemployment Guidance, 'What is a Medical Examination?' 42 U.S.C. 12114(c)(1)
Prescription medication, the chance to explain, and the Medical Review Officer (MRO). If you take a prescription that could show on a test, you will get a chance to explain it, usually to a Medical Review Officer. Tell the tester about prescriptions you take. EEOC Preemployment Guidance, lawful drug use during drug testing EEOC opioids page, Question 3
Confirmatory testing, MRO review, and the split specimen (federal program). If your federal-standard test is positive, a doctor (the MRO) will call you first. You then have 72 hours to ask for your second sample to be tested at another lab. Section 13.9(a) HHS Mandatory Guidelines (Urine), Section 13.9(b)
Refusal to test. Not showing up, leaving early, not cooperating, or tampering with a specimen counts as a refusal, and a refusal has the same result as a failed test. If you are an applicant and leave before the test begins, that is not a refusal. 49 CFR 40.191 49 CFR 40.191

If a result comes back positive

FCRA: when a drug test result is a consumer report. If a background screening company sends your drug test result to the employer, the FCRA may give you the right to a copy and a notice before the employer acts on it. FTC staff advisory opinion to Islinger (June 9, 1998) FTC staff advisory opinion to Islinger (June 9, 1998)
FCRA: medical information in an employment report (15 U.S.C. 1681b(g)). Before a screening company sends health-related results to an employer, you must give specific written consent that says how they will be used. 15 U.S.C. 1681b(g)(1)(B)(ii) 15 U.S.C. 1681b(b)(2)(A)
ADA: people in recovery and in treatment (including medication-assisted treatment). If you are in recovery or in a treatment program and not using illegal drugs, the ADA protects you. Taking prescribed MAT medicine as directed is lawful use. 42 U.S.C. 12114(b)(1) 42 U.S.C. 12114(b)(3)

If you get a pre-adverse action notice, read what to do next. If the report is wrong, you can dispute it for free.

Marijuana and CBD

Marijuana’s federal status (Controlled Substances Act scheduling) as of 2026-10-24. Federally, recreational marijuana is still illegal (Schedule I), even where your state allows it. State-licensed medical marijuana is now Schedule III federally, but that does not by itself stop a private employer from testing for THC; state law decides that. DOJ/DEA final rule, 91 FR 22714 (Apr 28, 2026), Summary; DATES: Effective April 28, 2026 same rule, Requirements for Handling
CBD and hemp products. Using CBD is not an excuse for a positive marijuana result on a DOT test. Some CBD products contain THC, so use caution. ODAPC CBD Notice (Feb 18, 2020) ODAPC CBD Notice (Feb 18, 2020)

Jobs regulated by DOT

Truck and bus drivers with a commercial license, pilots, and transit, rail, pipeline and maritime workers in safety-sensitive jobs.

Pre-employment drug test (verified negative before first safety-sensitive work). You must pass a DOT drug test, and the result must come back from the Medical Review Officer as negative, before you can start safety-sensitive work. 49 CFR 382.301 49 CFR 382.301
Medical Review Officer (MRO) verification interview. If your lab result is not negative, a doctor (the MRO) will call you before your employer hears anything. This is your chance to explain, for example with a valid prescription. If your employer tells you to call the MRO, call right away; after 72 hours the MRO can decide without you. 49 CFR 40.131 49 CFR 40.131
Request to test the split specimen. If the MRO verifies your test as positive, you have 72 hours from that call to ask the MRO to test your second (split) bottle at a different lab. You do not have to pay first. Your employer may ask you to pay it back later under its policy. 49 CFR 40.171 49 CFR 40.173
Previous employer drug and alcohol testing records (49 CFR 40.25). The new employer will ask for your written consent to get your DOT testing record from employers you worked for in the past two years. If you refuse to consent, you cannot do safety-sensitive work for them. 49 CFR 40.25 49 CFR 40.25
FMCSA Drug and Alcohol Clearinghouse pre-employment full query. If you drive with a CDL, the employer must check the federal Clearinghouse before you start. You will log in to the Clearinghouse and give electronic consent. If you refuse, you cannot drive for them. 49 CFR 382.701 49 CFR 382.703
Marijuana: federal scheduling status and DOT’s position (as of 2026-10-24). For DOT jobs, marijuana use is not allowed, even where your state allows it and even with a state medical card. DOT says a state-licensed product is not a legitimate medical explanation, so a confirmed marijuana positive is reported as positive. DEA final rule 2026-08176, 91 FR 22714 (Apr 28, 2026), SUMMARY; DATES: Effective April 28, 2026 DEA final rule 2026-08176

Your state

Whether your state has a drug testing law that limits employers, protects lawful off-duty cannabis use, or protects registered medical cannabis patients. Select a state for its rules in the employer guide.

State	Testing law	Off-duty cannabis protected	Medical cannabis protected
Alaska	Yes	No	No
Alabama	No	No	No
Arkansas	Yes	None found	Yes
Arizona	Yes	No	Yes
California	No	Yes	No
Colorado	No	No	No
Connecticut	Yes	Yes	Yes
District of Columbia	No	Yes	No
Delaware	No	No	Yes
Florida	Yes	No	No
Georgia	Yes	None found	None found
Hawaii	Yes	None found	None found
Iowa	Yes	No	No
Idaho	Yes	No	No
Illinois	No	Yes	Yes
Indiana	Not confirmed	Not confirmed	Not confirmed
Kansas	None found	No	No
Kentucky	None found	No	No
Louisiana	Yes	No	Yes
Massachusetts	None found	No	Yes
Maryland	Yes	No	Yes
Maine	Yes	No	Yes
Michigan	No	No	None found
Minnesota	Yes	Yes	Yes
Missouri	Not confirmed	None found	Yes
Mississippi	Yes	None found	None found
Montana	Yes	Yes	No
North Carolina	Yes	No	No
North Dakota	Yes	No	Yes
Nebraska	Yes	No	No
New Hampshire	None found	No	No
New Jersey	No	Yes	Yes
New Mexico	Not confirmed	Yes	Yes
Nevada	No	Yes	Yes
New York	None found	Yes	Yes
Ohio	No	Yes	Yes
Oklahoma	Yes	No	Yes
Oregon	Yes	No	No
Pennsylvania	None found	None found	Yes
Rhode Island	Yes	Yes	Yes
South Carolina	Yes	No	No
South Dakota	No	No	Yes
Tennessee	None found	None found	None found
Texas	No	No	No
Utah	Yes	None found	Yes
Virginia	No	No	Yes
Vermont	Yes	No	No
Washington	None found	Yes	No
Wisconsin	Yes	No	No
West Virginia	Yes	No	Yes
Wyoming	No	No	No

Yes: a law applies (see the state’s rules). No: a full search of the state’s code found none. None found: a search of the likely chapters found none. Not confirmed: the state’s code could not be searched; check with the state.

Questions job seekers ask

Can an employer test me without telling me?

When a screening company runs the test and reports the result, the employer must give you a written notice and get your written permission first. Some states also require a written testing policy you can see before you are tested.

Will CBD make me fail?

It can. Some CBD products contain more THC than the label says, and DOT does not accept CBD use as an explanation for a marijuana positive.

Is this legal advice?

No. It explains what the law says, with the source for each point. For your own situation, a legal aid office or a lawyer can help.

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Sources

Last reviewed October 24, 2026 · General information, not legal advice.