More and more workers in the U.S. are testing positive for fentanyl use during random drug tests, according to new data from Quest Diagnostics. After analyzing more than 8 million workforce drug tests ...

SECAUCUS, N.J., Sept. 2, 2025 /PRNewswire/ -- The percentage of employees in the general U.S. workforce testing positive for fentanyl in random drug tests far exceeded those in pre-employment testing, ...

More and more workers are cheating on drug tests, according to new data from Quest Diagnostics, with tampering rates reaching a 30-year high in 2023. After analyzing nearly 9.8 million workforce drug ...

The rate of substituted or invalid drug tests — an indication of tampering to hide drug use — rose more than six-fold in 2023 versus the prior year, according to a Quest Diagnostics analysis of 9.8 ...

Overall Drug Positivity Holds Steady at Historically High Rates while Marijuana Positivity Continued Upward Climb in the General U.S. Workforce Marijuana Positivity in the General U.S. Workforce ...

Amid Widespread Recruiting and Retention Challenges, Drug Positivity Increases in Post-Accident Tests at a Faster Rate Than Pre-Employment Tests for Cocaine, Marijuana, Opiates and Oxycodones SECAUCUS ...

SECAUCUS, N.J., April 11, 2019 /PRNewswire/ -- The rate of workforce drug positivity hit a fourteen-year high in 2018, according to a new analysis released today by Quest Diagnostics (NYSE: DGX), the ...