MADISON, N.J. May 6, 2009 - Cocaine use among U.S. employees and job applicants in the general U.S. workforce declined sharply in 2008, according to the annual Quest Diagnostics Drug Testing Index™ (DTI), based on 5.7 million urine drug tests performed last year by Quest Diagnostics (NYSE: DGX), the nation's leading provider of drug testing services. In addition, methamphetamine use in the general workforce declined year over year, yet positive urine tests for amphetamine showed an uptick in worker use of this stimulant drug. To view a multimedia version of this news release with all charts and maps, click here