Quest Diagnostics Drug Testing Index™

The Quest Diagnostics Drug Testing Index reveals insights into patterns of drug use among the American workforce. It has examined positivity rates for workplace drugs tested by the company on behalf of employers since 1988. Quest Diagnostics publishes these findings as a public service for government, employers, policymakers, and the general public.


  1. Quest Diagnostics Drug Testing Index™ (DTI) brochure
    The rate of workforce drug positivity hit a 16-year high in 2019. See the latest positivity data and trends in our 2020 report.
  2. Visit our newsroom for the official 2020 DTI press release
  3. DTI drug map
    Our one-of-a-kind interactive map illustrates drug positivity rates in urine testing for amphetamines, cocaine, heroin, marijuana, opiates, and PCP. Compare your state to the national average and see trends over time.
    View positivity rates by zip code
  4. DTI webinar
    Register for our Drug Testing Index webinar on September 10, 2020 at 1 PM CT featuring Barry Sample, PhD, senior director of science and technology, Quest Diagnostics and Ashlyn Hazard, Data analytics manager, Quest Diagnostics.
    Reserve your spot