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.
- Quest Diagnostics Drug Testing Index™ (DTI) brochure
- Visit our newsroom for the official DTI press release
- 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