--- title: "12-Month Hair Drug Test (One-Year Look-Back)" description: "Get a 12-month hair drug test near you with AMH Nationwide. Over 20,000 collection sites ensure accurate results. Call us now at (877) 731-6362." author: "AMH Nationwide" date: "2026-08-20" tags: ["hair drug testing near me"] canonical: "https://amhnationwide.com/12-month-hair-drug-test-ve/" last_updated: "2026-08-26" --- # 12-Month Hair Drug Test (One-Year Look-Back) **By AMH Nationwide** | August 20, 2026 Get a 12-month hair drug test near you with AMH Nationwide. Over 20,000 collection sites ensure accurate results. Call us now at (877) 731-6362. --- The 12-month hair drug test provides a thorough one-year look back at drug use by analyzing four consecutive 90-day hair segments. This test is ideal for employers and legal entities requiring extended drug detection. Collection is coordinated through national labs. Call (877) 731-6362 to arrange your test. OVERVIEW ## What is a 12-Month Hair Drug Test? A 12-month hair drug test, also known as a one year hair drug test or 12 month hair follicle test, analyzes hair samples to detect drug use over the past year. The test examines four 90-day segments of hair to provide a detailed timeline of drug exposure. This method is used when long-term drug history is required beyond standard 90-day tests. PROCESS ## How is the 12-Month Hair Drug Test Collected and Processed? The 12-month hair drug test requires a hair sample collected from the individual at an authorized collection site. AMH Nationwide directs the requester to one of five national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, or ExperTox. The hair sample is segmented into four 90-day periods for analysis. Once collected, the sample undergoes laboratory testing for specific drugs. Any non-negative result is reviewed by a certified Medical Review Officer as part of standard processing to ensure accuracy and proper interpretation. Collection through national labs: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, ExperTox Hair segmented into four 90-day periods covering 12 months Non-negative results reviewed by Medical Review Officer APPLICATIONS ## Who Typically Orders a One Year Look Back Hair Test? The 12-month hair drug test is commonly ordered by employers, legal professionals, and government agencies requiring extended drug use history. It is suitable for safety-sensitive roles not regulated by DOT, as DOT requires federally certified [urine](https://amhnationwide.com/urine-drug-testing/) testing under [49 CFR Part 40](https://www.transportation.gov/odapc/part40). This test provides a detailed drug use timeline over the past year. Employers conducting extended drug screening Legal cases requiring one-year drug history Non-DOT safety-sensitive job screenings DETECTION ## What Drugs Can the 12 Month Hair Follicle Test Detect? The 12-month hair drug test can detect a range of substances including marijuana, cocaine, opiates, amphetamines, and phencyclidine (PCP). Testing panels vary depending on the requester’s requirements. Detection windows extend up to one year by segmenting hair samples into four 90-day intervals. Marijuana (THC metabolites) Cocaine and metabolites Opiates including heroin and morphine Amphetamines and methamphetamines Phencyclidine (PCP) ## Schedule Your 12-Month Hair Drug Test Today To arrange a 12-month hair drug test, contact AMH Nationwide to locate a collection site within your area. Call (877) 731-6362 for assistance. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) TIMELINE AND PRICING ## How Long Does the 12-Month Hair Drug Test Take and What Does it Cost? Testing turnaround time typically ranges from a few days to one week depending on the laboratory and panel complexity. Pricing varies based on the specific drug panel and [detection window](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) requested. For a 12-month hair drug test, costs can be significant due to the extended analysis period. Call (877) 731-6362 for a detailed quote. LIMITATIONS ## What Are the Limitations of the One Year Look Back Hair Test? While the 12-month hair drug test offers extended detection, it may not detect very recent drug use within the past week due to hair growth rates. Hair treatments or damage can affect sample quality. This test is not acceptable for DOT-regulated testing which requires urine tests under federal protocols. 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, the 12-month hair drug test typically cannot detect drug use within the past 7 days because hair must grow out to capture drug metabolites. It provides a detailed history over the prior 12 months instead. No, DOT-regulated testing requires urine specimens collected under federal protocols (49 CFR Part 40). Hair tests, including the 12-month hair drug test, are for non-DOT roles. The collected hair sample is divided into four segments, each representing approximately 90 days of growth, allowing for a one-year drug use timeline. Any non-negative or positive screen is reviewed by a certified Medical Review Officer who assesses the result before final reporting. The test panel can include common drugs such as marijuana, cocaine, opiates, amphetamines, and PCP. Specific panels vary, so confirm with AMH Nationwide. AMH Nationwide does not provide online ordering. To schedule, call (877) 731-6362 to be directed to a collection site through our national lab partners. 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/12-month-hair-drug-test-ve/