Pre-employment urine drug screening: examining trends in THC-COOH positivity rates post-legalization of recreational cannabis in California – a retrospective review

Abstract Background This study examines trends in delta-9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH) positivity rates in pre-employment urine drug screenings at a single university-based hospital occupational medicine clinic from 2017 to 2022, following California’s recreational cannabis lega...

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Bibliographic Details

Published in:	Journal of Occupational Medicine and Toxicology
Main Authors:	Akbar Sharip, Roshan Razavi
Format:	Article
Language:	English
Published:	BMC 2025-09-01
Subjects:	Cannabis Drug screening Occupational medicine Recreational cannabis legalization THC-COOH
Online Access:	https://doi.org/10.1186/s12995-025-00468-3