Pre-employment Drug Testing: Urinalysis versus Hair Analysis

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Pre-employment drug testing through urine analysis is not the most effective way to test potential employees for illicit drug use. There are too many ways to alter a urine drug test and, with the exception of marijuana, urinalysis tests only show positive for drugs that have been used within two to three days of the test. Hair analysis is a far more effective way to screen for illegal drug use as it shows drug use and drug history for several months.

Carol Patten quotes a report that was just released by the Substance Abuse and Mental Health Services Administration stating that while drug use is more prevalent among the unemployed, 70% of people ages 18-49 who reported current illicit drug use or heavy drinker were currently employed. This means that 7.6% of all full time workers reported current illicit drug use. The Society for Human Resource Management (SHRM) defines illicit drug as having used an illegal drug or a legal drug in an illegal fashion within the past 30 days.

Employers understand this is costing them money. The bill for substance abuse problems includes much higher usage of medical benefits, increased sick time usage, absenteeism and lost production time. Because of this more and more corporations are requiring candidates to pass pre-employment drug tests upon acceptance of job offers.

There are different methods of drug testing; however, urinalysis is the most commonly used. The results of a urine test will show the presence or absence of drug metabolites in a person’s urine. Metabolites are drug residues that remain in the body for some time after the effects of a drug have worn off.

The U.S. Department of Labor lists the following drugs and estimates of the length of time that these drugs are detectable in urine:

• Amphetamines: 48 hours

• Barbiturates: 2-10 days

• Benzodiazepines: 2-3 weeks

• Cocaine: 2-10 days

• Heroin Metabolite: less than one day

• LSD: 8 hours

• Marijuana: 3-4 days for casual use; several months for chronic use

• Methadone: 2-3 days

• Methamphetamine: 2-3 days

• Phencyclidine (PCP): 1 week

There are several reasons why urinalysis is not the most effective and accurate pre- employment drug test. One reason is that as the number of companies requiring pre-employment drug testing has increased over the years, so have ways to adulterate a urinalysis test. Additionally, the usual process for requiring a pre-employment test is that when an offer of employment is extended the candidate is given several days to submit to a drug test.

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