Hair follicle drug tests involve removing a small hair sample for laboratory testing. Results can show if a person has been using certain drugs or prescription medications in the previous 3 months. It ...

Hair testing has gotten better over the years. Labs have standardized their procedures. And demand is rising, which will presumably continue to drive quality up and cost down. In late 2005 and early ...

The findings made headlines when they came out recently—more Americans failing workplace drug checks than at any time in the last decade. Quest Diagnostics’s report in September that workforce drug ...