Hair testing for drugs of abuse is the only drug-testing method available that provides up to a 90-day drug use history. This makes hair testing an ideal solution for pre-employment and random testing protocols.   When compared with urine specimen testing, hair testing provides up to 2.5 times the number of positives and a longer detection window.

Using FDA-cleared testing reagents, this lab-based test offers the advantages of easy specimen collection and highly accurate results that meet the same reference standards as urine testing. In addition, there are no known methods for sample adulteration (hair washing will not dilute the sample). Because specimen collection can be directly observed, the risk of adulteration is even further reduced.  Hair testing is also forensically defensible.
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Hair testing can test for the following class of drugs: