--- title: "How long does cocaine last in hair follicle drug test" description: "How long does cocaine last in hair follicle drug test? Cocaine can be detected for up to 90 days in hair samples. Contact AMH Nationwide for reliable testing. Call (877) 731-6362." author: "AMH Nationwide" date: "2026-08-28" tags: ["how long does cocaine last in hair follicle drug test"] canonical: "https://amhnationwide.com/how-long-does-cocaine-last-in-hair-follicle-drug-test/" last_updated: "2026-08-28" --- # How long does cocaine last in hair follicle drug test **By AMH Nationwide** | August 28, 2026 How long does cocaine last in hair follicle drug test? Cocaine can be detected for up to 90 days in hair samples. Contact AMH Nationwide for reliable testing. Call (877) 731-6362. --- How long does cocaine last in hair follicle drug test? Cocaine can be detected in hair follicles for up to 90 days after use, making hair testing a reliable method for long-term detection. Hair follicle tests analyze the drug metabolites embedded in the hair shaft. For accurate testing and lab collection, call (877) 731-6362. [DETECTION WINDOW](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) ## How long can cocaine be detected in a hair follicle drug test? Cocaine can be detected in a hair follicle drug test for up to 90 days or approximately three months after use. Hair testing identifies drug metabolites that are deposited in the hair shaft as it grows. This extended detection window is longer than [urine](https://amhnationwide.com/urine-drug-testing/) or blood testing, which typically detect cocaine for only a few days. Hair grows about half an inch per month, and standard hair follicle tests use 1.5 inches of hair to cover a 90-day detection period. This makes hair follicle tests useful for identifying cocaine use over a longer timeframe compared to other testing methods. Detection period: up to 90 days Sample length: typically 1.5 inches of hair Hair growth rate: approximately 0.5 inch per month Comparison: longer detection window than urine or blood tests TEST PROCESS ## What is involved in a hair follicle cocaine drug test? A hair follicle cocaine drug test involves collecting a small sample of hair, usually from the crown of the head. The sample is sent to one of AMH Nationwide’s five national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, or ExperTox for analysis. The labs extract metabolites from the hair shaft to detect cocaine use. Every non-negative result is reviewed by a certified Medical Review Officer (MRO) to ensure accuracy and to consider any legitimate prescriptions or medical explanations. AMH Nationwide coordinates the lab order and directs the requester to a nearby collection site. There is no online ordering available for this test. Sample collected from head hair, about 1.5 inches Sent to national labs: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, ExperTox Metabolites extracted and analyzed Non-negative results reviewed by certified Medical Review Officer No online ordering; call (877) 731-6362 to schedule RELIABILITY ## How reliable is hair follicle testing for cocaine? Hair follicle testing for cocaine is highly reliable due to the stable incorporation of drug metabolites into the hair shaft. Unlike urine or blood tests, hair testing is less susceptible to short-term fluctuations and attempts to adulterate or substitute samples. The testing process follows strict protocols and is performed by accredited labs under [SAMHSA](https://www.samhsa.gov/workplace/drug-testing)-aligned, CAP, and CLIA certifications. These standards ensure consistent quality and credible results for employers, courts, [probation](https://amhnationwide.com/hair-follicle-drug-test-probation/) officers, and individuals requesting testing. Stable detection of cocaine metabolites in hair Less vulnerable to tampering compared to urine tests Accredited labs with SAMHSA, CAP, and CLIA certifications Results reviewed by certified Medical Review Officers Trusted by employers, courts, and probation services PASSIVE EXPOSURE ## Can passive cocaine exposure cause a positive hair follicle drug test? Passive exposure to cocaine, such as incidental contact with smoke or residue, is unlikely to produce a positive hair follicle drug test. The test detects cocaine metabolites that form internally after the drug is ingested, not just external contamination. Labs use washing procedures to remove external contaminants and differentiate between actual use and environmental exposure. If metabolites are detected internally, it indicates cocaine use rather than passive exposure. Test detects internal metabolites, not external contamination Lab washing removes environmental residues Positive results indicate actual cocaine use Passive exposure rarely causes positive results ## Schedule a Hair Follicle Cocaine Drug Test Today For accurate and reliable cocaine detection up to 90 days, contact AMH Nationwide. We coordinate collection at accredited labs nationwide. Call (877) 731-6362 to arrange testing. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) USE CASES ## Who orders hair follicle cocaine drug tests and why? Hair follicle cocaine drug tests are commonly ordered by employers, courts, probation agencies, and individuals who require a long-term drug use history. This test is useful for safety-sensitive positions and legal cases where extended detection windows are necessary. Because hair testing covers up to 90 days, it provides a broader view of cocaine use compared to urine or saliva tests. AMH Nationwide facilitates these tests by directing clients to one of 20,000+ nationwide collection sites connected to major lab networks. Employers screening for workplace safety Courts and probation monitoring compliance Individuals needing documented drug use history Safety-sensitive non-DOT roles often use hair testing TEST LIMITATIONS ## What are the limitations of hair follicle cocaine drug tests? Hair follicle testing cannot detect very recent cocaine use within the past 5 to 7 days because the hair containing metabolites has not yet grown above the scalp. Additionally, hair treatments like bleaching or dyeing may affect test results but do not guarantee a negative outcome. The cost of testing varies depending on the panel and detection window requested. To obtain pricing or schedule a test, contact AMH Nationwide directly. There is no online ordering available. Cannot detect cocaine use within 5-7 days prior to collection Hair treatments may influence but not negate results Cost varies by panel and detection period Call (877) 731-6362 for quotes and scheduling 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-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 Hair follicle testing generally detects cocaine use about 5 to 7 days after ingestion, once the hair containing metabolites has grown above the scalp. Standard hair follicle tests typically analyze the most recent 1.5 inches of hair, reflecting approximately 90 days. Detection beyond this period requires longer hair samples but is less common. Hair color may slightly influence drug binding, with darker hair sometimes showing higher concentrations, but labs account for this and it does not prevent reliable detection. No. DOT-regulated safety-sensitive testing requires federally certified urine testing protocols under [49 CFR Part 40](https://www.transportation.gov/odapc/part40). Hair testing is only used for non-DOT roles. All non-negative results are reviewed by a certified Medical Review Officer who evaluates the findings and any legitimate medical explanations before final reporting. No. AMH Nationwide does not offer online ordering. You must call (877) 731-6362 to schedule testing and be directed to a collection site.}]} 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/how-long-does-cocaine-last-in-hair-follicle-drug-test/