How Far Back Does a Hair Follicle Test Detect Drugs?
Key Takeaways: Detection Window: Hair follicle tests typically detect drug use up to 90 days, based on the standard 1.5-inch hair sample. How It Works: Drugs enter the hair through the bloodstream, becoming trapped in the hair shaft as it grows, creating a timeline of use. Factors Influencing Results: Hair growth rates, color, body vs. […]