Why use hair analysis for pre-employment testing in the workplace?
A.Urine pre-employment testing is often called a “liquid IQ” test. Is the applicant smart enough to abstain from drug use for a week before the drug test? The most serious challenge to an effective pre-employment drug testing program is the limited detection time of drugs in urine. Amphetamine, opiate, PCP and cocaine have average limits of detection of 3 to 5 days. With the new screening kits currently sold to laboratories, marijuana has an average detection time of up to a week or two in urine. Conversely, drug deposits in hair remain as long as the hair is left uncut. Laboratories generally, and APL specifically, are testing for drugs deposited in hair over a period of approximately 90 days. Urine appears to be more susceptible to adulteration, hydration and switching. The applicant has ample time while searching for employment to plan a method to avoid a positive result in urine. High Times magazine (easily found at the news stand) and the Internet offer methods on “how to beat a u