Fentanyl positivity is more than seven times higher in random tests vs. pre-employment drug screening, finds 2025 quest diagnostics drug testing index

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 pre-employment testing, according to the 2025 quest diagnostics drug testing index™ from quest diagnostics (nyse: dgx), a leading provider of diagnostic information services.
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