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Quest Diagnostics Drug Testing Index

Workforce Drug Test Positivity Rate Increases for the First Time in 10 Years, Driven by Marijuana and Amphetamines, Finds Quest Diagnostics Drug Testing Index™ Analysis of Employment Drug Tests


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Madison, N.J., September 11, 2014 – The percentage of positive drug tests among American workers has increased for the first time in more than a decade, fueled by a rise in marijuana and amphetamines, according to an analysis of 8.5 million urine, oral fluid and hair workplace drug test results released today by Quest Diagnostics (NYSE: DGX), the world’s leading provider of diagnostic information services.

The Quest Diagnostics Drug Testing Index (DTI) shows that the positivity rate for 7.6 million urine drug tests in the combined U.S. workforce increased to 3.7 percent in 2013, compared to 3.5 percent in 2012. The relative increase of 5.7 percent year-over-year is the first time the positivity rate for combined national workplace urine drug tests has increased since 2003. Quest Diagnostics has analyzed annual workplace drug testing data since 1988. 

“After years of declines, the prevalence of positive workforce drug tests is increasing,” said Dr. Barry Sample, director, science and technology, Quest Diagnostics Employer Solutions, a business of Quest Diagnostics. “This increase indicates that employers should be aware of the potential for drug use by their workers and the risk that represents for the health and safety of their employees and the public.”

The 2013 Drug Testing Index analyzed urine, oral fluid and hair drug tests performed by Quest Diagnostics workplace drug testing laboratories across the United States. Test results are analyzed according to three categories of workers: employees with private companies (U.S. general workforce); employees subject to federal drug testing rules, including safety-sensitive truck drivers, train operators, airline and nuclear power plant workers (federally mandated safety-sensitive workers); and a combination of both groups (combined U.S. workforce).

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