Marijuana Drug Testing Laws by State for Employers (2025)

Marijuana drug testing is getting harder for employers as state laws change rapidly while cannabis remains illegal under federal law. In this episode of Joe Riley on Drug Testing in America, Joe Riley and Phil Dubois (Workplace Screening Intelligence) explain how marijuana testing rules vary by state, why DOT-regulated employers must continue testing, and what non-DOT companies can do to stay compliant. You’ll also learn which states have the strictest marijuana testing limits, why CBD use can still trigger a positive THC result, when oral fluid testing may be a better option, and how state-specific written drug testing policies and training can reduce risk and protect workplace safety.