Research & Education JFS Articles AAFS Connect Conference Proceedings Reference Series Library International Educational Outreach Program Delta-9-Tetrahydrocannabinol (THC) Concentrations in Drivers Testing Positive for Marijuana Use and Consequences for the Effectiveness of a THC Per Se Law Presenting section: Toxicology 2014 Logan, Barry K., Horsham PA; Chan-Hosokawa, Ayako, Horsham PA View the paper Toxicology