Fentanyl Positivity Is More Than Seven Times Higher in Random Tests vs. Pre-Employment Drug Screening, Finds 2025 Quest Diagnostics Drug Testing Index

(NYSE:DGX) Majority of fentanyl positives also contain other drugs, with co-positivity with marijuana doubling since 2020 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...