What is Hair drug testing?
Hair testing analyzes a hair sample for parent drugs and their metabolites. A hair specimen, collected from a donor’s head or body, is sent to the laboratory and is screened for illicit substances.
How soon after use can a drug be detected in hair?
It takes approximately 5-10 days from the time of drug use for the hair containing drug to grow above the scalp where it can be collected.
What time period does hair testing cover?
The typical length of head hair tested is 1½ inches from the root end. Since the average growth rate of human head hair is approximately ½ inch (1.3 cm) per month a hair analysis covers an approximate 90 day time frame. This time frame is an approximation only since an individual’s actual hair growth rate may vary from the average.
Does hair color effect results?
Hair color is determined by the amount of melanin in the hair. It has been shown experimentally, through actual hair samples, as well as determined in court that hair color has no significant impact on results.