15/11/2025
United States | Current cannabis blood concentrations used to identify impaired drivers could land innocent people in jail
A new study demonstrates that many regular ‘marijuana’ users exceed legal blood cannabis limits for US drivers despite showing no evidence of impairment. The findings, published in the Association for Diagnostics & Laboratory Medicine’s (formerly AACC’s) Clinical Chemistry journal, contribute to evidence that cannabis blood limit laws lack scientific credibility and are not an accurate determinant of when drivers should face criminal charges or not...
Researchers measured baseline concentrations of THC in 190 regular cannabis users after instructing participants to abstain from cannabis for at least 48 hours. Following abstention, the researchers also evaluated driving performance in this group using a driving simulator. From this, the team found that many regular users of cannabis exceed zero tolerance and per se THC cut-off point concentrations days after their last use... https://myadlm.org/media/press-release-archive/2025/11-nov/current-cannabis-blood-concentrations-could-land-innocent-people-in-jail
