What Jobs Do Hair Drug Test and Why Hair Follicle Testing Matters

What jobs do hair drug test?

Hair drug testing is primarily used in jobs where long-term substance use history is critical. These jobs often involve safety-sensitive roles or high-security environments where employers need reliable detection of past drug use.

Typical jobs that require hair follicle drug testing include law enforcement, federal government positions, certain healthcare roles, and some corporate security jobs. Hair testing is favored because it can detect drug use up to 90 days prior, unlike urine tests that detect recent use only.

Employers in these fields choose hair drug testing to ensure workplace safety and compliance with regulations. Hair follicle drug testing is not mandated for DOT safety-sensitive positions, which require federally certified urine testing under 49 CFR Part 40. However, hair testing is commonly used for non-DOT roles.

How long does hair follicle drug testing detect drug use?

Hair follicle drug testing detects drug metabolites deposited in the hair shaft over time, providing a detection window of up to 90 days, sometimes longer depending on hair length. This contrasts with urine testing, which typically detects drug use within a few days.

The extended detection window makes hair testing useful for employers who want a comprehensive history of substance use rather than recent or one-time usage. However, hair testing cannot determine exact timing or frequency of use within the detection window.

Because of this long detection window, hair follicle drug testing is often used in pre-employment screening, random testing, and post-incident investigations for positions where safety and security are paramount.

How is hair follicle drug testing conducted?

Hair follicle drug testing involves collecting a small sample of hair, usually from the scalp, which is then sent to one of AMH Nationwide’s five national lab networks: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, or ExperTox.

The collection is performed at designated collection sites after the lab order is issued by AMH Nationwide. There is no online ordering. After collection, the sample undergoes laboratory analysis, and any non-negative results are reviewed by a certified Medical Review Officer (MRO) to ensure accuracy and validity.

This process ensures reliable and legally defensible results for employers and individuals. Hair testing requires no special preparation but cannot detect drug use within the past week due to the time it takes for hair to grow out.

Who typically orders hair follicle drug testing?

Hair follicle drug testing is ordered by employers, courts, probation officers, and sometimes individuals seeking comprehensive drug use history. Employers in safety-sensitive industries or high-security roles often require this testing as part of pre-employment screening or ongoing compliance.

Courts and probation departments may use hair testing to monitor abstinence over a longer period. Individuals may also request hair testing for personal reasons or to satisfy legal or administrative requirements.

AMH Nationwide facilitates the lab order and directs clients to the nearest collection site. Phone consultation is necessary to initiate testing.

How accurate and reliable is hair follicle drug testing?

Hair follicle drug testing is highly accurate when performed by accredited labs such as those partnered with AMH Nationwide. The testing detects drug metabolites embedded in the hair shaft, minimizing the risk of tampering or adulteration.

Every non-negative result undergoes review by a certified Medical Review Officer to confirm the findings and rule out false positives. This review adds an additional layer of reliability to the testing process.

Employers and individuals can trust hair follicle drug testing for dependable, long-term drug use detection. However, it is not suitable for DOT-regulated safety-sensitive testing, which requires federally certified urine protocols.

What are the limitations of hair follicle drug testing?

Hair follicle drug testing cannot detect drug use within the past 7 days because hair must grow out to show metabolites. It also cannot specify exact dates or frequency of drug use within the detection window.

Additionally, some hair types or treatments can affect test results, though labs account for these variables. Hair testing is not accepted for DOT safety-sensitive roles due to regulatory requirements mandating urine testing under 49 CFR Part 40.

Employers should consider these limitations when choosing hair follicle drug testing and consult AMH Nationwide for guidance on appropriate testing methods.

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