--- title: "Smoked 3 times in 90 days hair test" description: "Smoked 3 times in 90 days hair test detects THC reliably in hair follicles. Understand detection windows and lab procedures. Call (877) 731-6362 to schedule." author: "AMH Nationwide" date: "2026-08-28" tags: ["smoked 3 times in 90 days hair test", "smoked 3 times in 90 days hair test | how long does weed stay in a hair follicle test | how long can thc be detected in hair | how long does weed last in hair | how long does pot stay in hair drug test | how long does weed stay in a hair test | how long does weed stay in your system hair test | how long does cannabis stay in your system hair test | how long does thc stay in your hair sample | how long does weed stay in a hair sample"] canonical: "https://amhnationwide.com/smoked-3-times-in-90-days-hair-test/" last_updated: "2026-08-28" --- # Smoked 3 times in 90 days hair test **By AMH Nationwide** | August 28, 2026 Smoked 3 times in 90 days hair test detects THC reliably in hair follicles. Understand detection windows and lab procedures. Call (877) 731-6362 to schedule. --- A smoked 3 times in 90 days hair test detects THC metabolites deposited in hair follicles during that period. This test can reliably identify cannabis use over approximately 90 days. Hair samples are sent to national labs including Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. Call (877) 731-6362 to arrange testing. TEST BASICS ## What is a smoked 3 times in 90 days hair test? A smoked 3 times in 90 days hair test is a drug screening that analyzes hair samples to detect cannabis use within the previous three months. This test identifies THC metabolites embedded in the hair shaft as it grows, providing a [detection window](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) of roughly 90 days. The test is commonly ordered by employers, courts, or [probation](https://amhnationwide.com/hair-follicle-drug-test-probation/) agencies to verify cannabis consumption over an extended period rather than recent or one-time use. Hair samples are collected at authorized sites nationwide and sent to one of five major national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, or ExperTox. Each sample undergoes screening, and any non-negative results are reviewed by a certified Medical Review Officer to ensure accuracy and compliance. DETECTION WINDOW ## How long does weed stay in a hair follicle test? Weed, or cannabis, leaves THC metabolites in hair follicles as hair grows. Generally, hair drug tests detect cannabis use for up to 90 days after consumption. This 90-day detection window corresponds to the average hair growth rate of about 0.5 inches per month, with labs testing approximately 1.5 inches of hair closest to the scalp. Because hair grows slowly, THC metabolites are deposited in the hair shaft and remain there until the hair is cut or naturally shed. Therefore, if someone smoked three times in 90 days, the hair test can typically detect those uses reliably within that timeframe. THC IN HAIR ## How long can THC be detected in hair samples? THC can be detected in hair samples for up to 90 days, sometimes longer depending on hair length and growth rate. The test analyzes the hair shaft for THC metabolites, which are incorporated as hair forms beneath the scalp. Unlike [urine](https://amhnationwide.com/urine-drug-testing/) or blood tests, which detect recent use within days or weeks, hair tests provide a historical record of drug use. However, detection beyond 90 days becomes less reliable as labs usually limit testing to the most recent 1.5 inches of hair. TESTING PROCEDURE ## How does the smoked 3 times in 90 days hair test work? The testing process starts with the requester contacting AMH Nationwide to schedule collection at a local site. A small hair sample, typically from the scalp, is collected and sent to one of the five national labs for analysis. The lab uses immunoassay screening followed by confirmatory testing with gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-tandem mass spectrometry (LC-MS/MS) to detect THC metabolites. Non-negative results undergo Medical Review Officer evaluation before reporting to ensure accuracy and interpret any legitimate medical explanations. ## Schedule Your Hair Drug Test Today Contact AMH Nationwide to arrange a smoked 3 times in 90 days hair test at a convenient local collection site. Call (877) 731-6362 to speak with a representative. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) TEST ACCURACY ## Can a hair test detect smoking cannabis three times in 90 days accurately? Yes, a hair test can accurately detect cannabis use three times in 90 days due to the incorporation of THC metabolites into the hair shaft. The test does not measure exact frequency but identifies cumulative exposure within the detection window. Factors such as hair color, hair treatments, and individual metabolism can slightly affect results, but the testing methods used by AMH Nationwide’s partnered labs maintain high scientific reliability and chain-of-custody standards. LIMITATIONS ## What are the limitations of the smoked 3 times in 90 days hair test? Hair testing cannot pinpoint the exact dates or number of cannabis uses, only that use occurred within the detection window. It also does not detect very recent use within the past week as hair needs time to grow out of the scalp. Additionally, hair treatments like bleaching or dyeing may reduce detectable THC levels, but labs account for these variables. Passive exposure to cannabis smoke is unlikely to produce a positive hair result at the thresholds used. 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 Weed can be detected in hair samples for up to 90 days, as THC metabolites are deposited in the hair shaft during growth and remain until cut or shed. Hair tests detect cumulative exposure over the detection window but cannot specify the exact number of uses or dates of consumption. Passive exposure is unlikely to produce a positive hair test result because the threshold for detection requires metabolite levels consistent with actual use. Typically, 1.5 inches of hair closest to the scalp, about the diameter of a pencil, is collected to cover the 90-day detection window. No, DOT-regulated safety-sensitive testing requires federally certified urine testing under [49 CFR Part 40](https://www.transportation.gov/odapc/part40). Hair testing is used for non-DOT roles. Hair treatments like bleaching or dyeing may reduce detectable THC levels, but modern testing methods compensate for these factors to maintain accuracy. 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/smoked-3-times-in-90-days-hair-test/