Latest Quest Diagnostics Drug Testing Index

Workforce drug positivity at highest rate in a decade

The Quest Diagnostics Drug Testing Index™ reveals insights into patterns of drug use among the U.S. workforce. It has been published annually years as a public service for government, employers, media, and the general public. To commemorate our 30th anniversary, we created a special historical timeline to highlight important milestones and positivity rates spanning three decades.


Key insights from the 2018 data include:
• Cocaine positivity rates increased for the fifth consecutive year in the general U.S. workforce across every specimen type
• Marijuana positivity continued its five-year upward trajectory
• Increases in marijuana positivity rates were most striking in states that have enacted new recreational use statues
• Methamphetamine positivity skyrocketed in the Midwest and Southern states
• Prescription opiates continue to decline in workforce testing data

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