In cases of heavy use, it’s been detected up to 30 days after the last use. THC, the psychoactive property in marijuana, can be identified ... in the system. Blood tests typically only detect ...

The DuPage County state's attorney announced Friday that it is dismissing charges in 19 cases involving defendants accused of driving under the influence of marijuana after faulty blood testing ...

DuPage County State's Attorney Robert Berlin on Friday said he decided to drop charges in 19 cases involving individuals who allegedly drove under the influence of marijuana, citing incorrect ...

Ohio State Highway Patrol said this is part of a pilot program, and it's not being done in response to the legalization of recreational marijuana.