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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.
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 —
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California legalized medical weed 25 years ago, spurring a nationwide shift. But federal government rules stymie research on marijuana's potential.