The Quest Diagnostics Drug Testing Index™ (DTI) 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.
The DTI is a series of reports that provide insights into trends in workforce drug use based on positivity rates of deidentified laboratory tests performed by Quest Diagnostics for a range of illicit, legal and prescription drugs. It examines test results according to three categories of workers: the federally mandated, safety-sensitive workforce; the general U.S. 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 government agencies like the Department of Transportation, the Nuclear Regulatory Commission and the Department of Defense.
