--- title: "Can being around weed cause a positive drug test" description: "Can being around weed cause a positive drug test? Learn how secondhand smoke affects hair and urine tests. Call (877) 731-6362 for testing info." author: "AMH Nationwide" date: "2026-08-28" tags: ["can being around weed cause a positive drug test", "can being around weed cause a positive drug test | can you fail a hair follicle test for secondhand smoke | can you fail a hair drug test from secondhand smoke | can secondhand smoke show in drug test"] canonical: "https://amhnationwide.com/can-being-around-weed-cause-a-positive-drug-test/" last_updated: "2026-08-28" --- # Can being around weed cause a positive drug test **By AMH Nationwide** | August 28, 2026 Can being around weed cause a positive drug test? Learn how secondhand smoke affects hair and urine tests. Call (877) 731-6362 for testing info. --- Can being around weed cause a positive drug test? Passive exposure to marijuana smoke rarely causes a positive drug test, especially in hair follicle tests. Urine tests are more sensitive but require significant exposure. AMH Nationwide uses certified labs and Medical Review Officers to ensure accuracy. Call (877) 731-6362. OVERVIEW ## Can being around weed cause a positive drug test? Being around weed, or passive exposure to marijuana smoke, is unlikely to cause a positive drug test under normal circumstances. Most drug tests are designed to detect active use, not incidental exposure. However, the likelihood depends on the type of test, the environment, and the amount of smoke inhaled. HAIR TESTING ## Can you fail a hair follicle test for secondhand smoke? Failing a hair follicle test from secondhand marijuana smoke is highly unlikely. Hair drug testing detects metabolites deposited in the hair shaft from bloodstream exposure, which requires direct consumption or repeated use. Passive exposure to smoke does not usually generate sufficient metabolites to cause a positive result. [URINE](https://amhnationwide.com/urine-drug-testing/) TESTING ## Can secondhand smoke show in a urine drug test? Secondhand marijuana smoke can rarely cause a positive urine drug test, but only in extreme cases such as prolonged exposure in a confined space with heavy smoke. Urine tests detect THC metabolites typically present after active use, and incidental inhalation usually results in levels below detection thresholds. TESTING PROTOCOLS ## How does AMH Nationwide ensure accurate drug test results? AMH Nationwide routes collections through five national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, and ExperTox. All non-negative drug screens are reviewed by a certified Medical Review Officer (MRO). For DOT-regulated safety-sensitive testing, federally certified urine protocols under [49 CFR Part 40](https://www.transportation.gov/odapc/part40) are followed. Hair tests are used mainly for non-DOT roles. ## Need Accurate Drug Testing? Contact AMH Nationwide For reliable marijuana testing with certified labs and Medical Review Officer oversight, call (877) 731-6362 or contact us to schedule your collection. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) DETECTION WINDOWS ## What are the detection windows for marijuana in hair and urine tests? Hair follicle tests can detect marijuana use within roughly 7 to 90 days after use, as metabolites are incorporated into hair strands. Urine tests typically detect recent use within 3 to 30 days depending on frequency and amount. Passive exposure generally does not produce detectable levels within these windows. TEST ORDERING ## How can I get tested for marijuana exposure through AMH Nationwide? AMH Nationwide provides lab orders and directs individuals to collection sites nationwide. There is no online ordering. To arrange a drug test or discuss testing options, call (877) 731-6362. Pricing varies by test panel and [detection window](https://amhnationwide.com/hair-follicle-drug-test-detection-window/). AMH Reviewed & Maintained By AMH Nationwide Customer Service AMH Nationwide is BBB A+ accredited and routes every order through Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, or ExperTox, all of which use multiple lab certification agencies and standards such as [SAMHSA](https://www.samhsa.gov/workplace/drug-testing)-aligned laboratory protocols, the ANSI National Accreditation Board for forensic testing and calibration, the College of American Pathologists (CAP), and Clinical Laboratory Improvement Amendments (CLIA). Every non-negative screen is reviewed by a certified Medical Review Officer as part of standard processing before a result is released, and chain-of-custody documentation is maintained on every collection. This page does not constitute medical or legal advice. **Last updated:** July 2026 You May Also Need [Nail Drug TestingNo head or body hair available? A 5-panel fingernail test covers a similar look-back window.Learn more →](https://amhnationwide.com/5-panel-fingernail-drug-test/)[ChildGuard: Environmental ExposureConcerned about a child or loved one? ChildGuard screens for exposure to drugs in their environment.Learn more →](https://amhnationwide.com/5-panel-hair-drug-test-environmental-exposure-childguard/)[Shorten the Detection WindowShortened options like 30 and 60 day hair panels are also available, useful when a urine test’s 1-3 day window is too short.Learn more →](https://amhnationwide.com/30-day-hair-drug-test/)[Hair ETG Alcohol TestAlso need alcohol testing? The hair ETG test screens for alcohol use, and can be added to the same collection.Learn more →](https://amhnationwide.com/etg-and-peth/) Frequently Asked Questions ## Common Questions No, hair drug tests detect metabolites from active use incorporated into the hair shaft. Passive exposure to smoke does not produce enough metabolites to cause a positive hair test result. It is very unlikely unless there is prolonged, heavy exposure in a confined area. Urine tests detect THC metabolites from active use, and incidental inhalation typically results in levels below detection limits. AMH Nationwide routes testing through five national lab networks: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. Yes, all non-negative drug screens are reviewed by a certified Medical Review Officer as part of standard processing to ensure accuracy. Hair tests typically detect drug use within a 7 to 90-day window. Use beyond 90 days is generally not detected due to hair growth rates and segment testing. AMH Nationwide does not offer online ordering. To schedule a test, call (877) 731-6362 to receive a lab order and collection site referral. Sources • [SAMHSA – Mandatory Guidelines for Federal Workplace Drug Testing Programs](https://www.samhsa.gov/workplace/drug-testing) • [U.S. DOT – 49 CFR Part 40 – Procedures for Transportation Workplace Drug and Alcohol Testing Programs](https://www.transportation.gov/odapc/part40) • [CDC – National Center for Health Statistics – Drug Use FastStats](https://www.cdc.gov/nchs/fastats/drug-use.htm) • [Quest Diagnostics – Employer Solutions, Hair Testing Methodology](https://www.questdiagnostics.com/) • [LabCorp – Occupational Testing Services](https://www.labcorp.com/) ## Ready to get started? AMH Nationwide provides the lab order and arranges collection nationwide. Every non-negative result reviewed by a certified Medical Review Officer. Call (877) 731-6362 or contact us. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) --- **Need a drug, alcohol, HIV or STD test?** AMH Nationwide is a national lab testing agency operating since 2004, with more than 20,000 collection sites across the United States. Hair, urine, fingernail and blood testing, panels from 5 through 19, for individuals and employers. - Call: (877) 731-6377 - Find a collection site: https://amhnationwide.com/locations/ - Full page: https://amhnationwide.com/can-being-around-weed-cause-a-positive-drug-test/