Following years of declines, the percentage of employees in the combined U.S. workforce testing positive for drugs has steadily increased over the last three years to a 10-year high.
An analysis of nearly 11 million workforce drug test results by Quest Diagnostics reveals a fifth straight year of increases in detection rate of amphetamine and heroin and shows that marijuana positivity has increased 47 percent since 2013. Nearly one in 11 job applicants were unable to pass an oral fluid drug screen.
The Quest Diagnostics Drug Testing Index (DTI) examines illicit drug use by analyzing millions of urine, oral fluid, and hair laboratory-based tests performed nationally by the company for employers in 2015.
The findings were unveiled this week at the Substance Abuse Program Administrators Association (SAPAA) annual conference being held in Louisville, Kentucky.
“Our nationally representative analysis clearly shows that drug use by the American workforce is on the rise, and this trend extends to several different classes of drugs and categories of drug tests,” said Barry Sample, Ph.D., senior director, science and technology, Quest Diagnostics Employer Solutions. “The 2015 findings related to post-accident testing results should also be of concern to employers, especially those with safety-sensitive employees.”
Among drug testing methods, overall positivity in the general U.S. workforce was highest in hair drug tests, at 10.3 percent in 2015, a seven percent increase over 2014 (9.6%) According to Quest, hair testing can give a more complete drug-use history because it shows repetitive drug use as far back as 90 days. By comparison, urine detects recent or new drug use, typically in one to three days, and oral fluid detects recent drug use in the previous 24-48 hours.
The positivity rate for 9.5 million urine drug tests in the combined U.S. workforce increased to four percent, a relative change of 2.6 percent over the positivity rate in 2014 and a relative increase of 14 percent over the 10-year low of 3.5 percent observed in both 2010 and 2011. The last year that the positivity rate for urine drug tests in the combined U.S. workforce was at or above four percent was 2005, when it reached 4.1 percent.
In the general U.S. workforce, the rate of amphetamine, marijuana, and heroin detection increased annually for the past five years in urine testing. Amphetamine positivity increased 44 percent and marijuana positivity increased 26 percent since 2011; almost half (45%) of individuals in the general U.S. workforce with a positive drug test for any substance in 2015 showed evidence of marijuana use. Heroin positivity in that period, indicated by the presence of the 6-acetylmorphine marker (6-AM), increased 146 percent. Oxycodone positivity rate has declined annually since 2011, confirming previous research showing that opioid prescriptions have declined in 49 states since 2012.
The results show a rising positivity rate for post-accident urine drug testing. Post-accident positivity increased 6.2 percent in 2015 when compared to 2014 (6.9% versus 6.5%) and increased 30 percent since 2011 (5.3%).
In oral fluid drug testing, the overall positivity rate increased 47 percent over the last three years in the general U.S. workforce to 9.1 percent in 2015 from 6.7 percent in 2013. The increase was largely driven by double-digit increases in marijuana positivity during this time period. In 2015, there was a 25 percent relative increase in marijuana detection as compared to 2014 (7.5% versus 6.0%). Slightly more than nine percent of oral fluid test results were positive for one or more drugs, suggesting that nearly one in eleven job applicants were unable to pass an oral fluid drug screen.
“The DTI statistics for the last five years underscore the threat to employers – and employees – from drug abusers in our workplace. The numbers on hair testing – the methodology with the longest look-back and therefore a more telling measurement of regular use – show a 34-percent positive-rate increase for illegal drug use by the general workforce in the last five years,” said Mark de Bernardo, executive director, Institute for a Drug-Free Workplace. “However, all the numbers for various testing methodologies confirm this disturbing trend and should provide a wake-up call to employers to do more to combat workplace substance abuse and to do it more effectively.”
The report did show a decline in workplace drug test positives for certain prescription opiates but an increase in heroin positives.
“This rise in heroin should concern both policymakers and employers. Substance abuse is a safety risk for everyone. This new workplace evidence is an additional sign of the rising national heroin problem, this time in the workplace,” said Robert DuPont, M.D., former director of the National Institute on Drug Abuse (NIDA).
The DTI examines test results according to three categories of workers: federally mandated, safety-sensitive workers; the general workforce; and the combined U.S. workforce. Federally- mandated, safety-sensitive workers include pilots, bus and truck drivers, and workers in nuclear power plants, for whom routine drug testing is mandated by the U.S. Department of Transportation and the Nuclear Regulatory Commission. Quest Diagnostics has analyzed annual workplace drug testing data since 1988. The strengths of the Drug Testing Index analysis include its large, nationally representative sample size, longitudinal monitoring, a testing population that is generally reflective of the U.S. workforce and the quality of the company’s drug testing services to confirm positive results. Limitations include analysis only of employers that perform drug testing with the company and a lack of exact cross-specimen comparisons due to variations in substances for which employers test.
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