If hiring drug-free employees is very important to your company, urinalysis can detect recent use, but hair testing can tell you much more. Urinalysis typically detects only drug use from the past 48 to 72 hours. But what about drug use in the weeks or months prior to the test? Hair testing can identify drug use as far back as three months and it is much more difficult to tamper with than urine testing. This white paper reveals key findings from a comparative test conducted by J.B. Hunt, a top for-hire motor carrier, a comparative drug testing index by Quest Diagnostics and more.