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The steady rise in the use of cannabis — 18 states have legalized recreational use, 13 have decriminalized its use and 36 have medical cannabis laws — has provoked myriad questions and concerns about public health implications, including how cannabis may affect the abilities, real and perceived, of drivers under the influence. In a novel, two-year randomized trial, conducted at the Center for Medicinal Cannabis Research (CMCR) at University of California San Diego School of Medicine, researchers recruited 191 regular cannabis users to partake of cannabis containing different levels of delt...

The steady rise in the use of cannabis — 18 states have legalized recreational use, 13 have decriminalized its use and 36 have medical cannabis laws — has

The steady rise in the use of cannabis -; 18 states have legalized recreational use, 13 have decriminalized its use and 36 have medical cannabis laws -; has provoked myriad questions and concerns about public health implications, including how cannabis may affect the abilities, real and perceived, of drivers under the influence.

The largest study of its kind shows approximately 50 percent of drivers could be considered impaired.

The steady rise in the use of cannabis — 18 states have legalized recreational use, 13 have decriminalized its use and 36 have medical cannabis laws —