According to AP:
WASHINGTON (AP) — Motorists are being convicted of driving under the influence of marijuana based on arbitrary state standards that have no connection to whether the driver was actually impaired, says a study by the nation’s largest auto club.
The problem is only growing as more states contemplate legalizing the drug. At least three, and possibly as many as 11 states, will vote this fall on ballot measures to legalize marijuana for medicinal or recreational use, or both. Legislation to legalize the drug has also been introduced in a half dozen states.
Currently, six states where medical or recreational marijuana use is legal — Colorado, Montana, Nevada, Ohio, Pennsylvania and Washington — have set specific limits for THC, the chemical in marijuana that makes people high, in drivers’ blood. But the study by AAA’s safety foundation says the limits have no scientific basis and can result in innocent drivers being convicted, and guilty drivers being released.
“There is understandably a strong desire by both lawmakers and the public to create legal limits for marijuana impairment in the same manner we do alcohol,” said Marshall Doney, AAA’s president and CEO. “In the case of marijuana, this approach is flawed and not supported by scientific research.”
Source: Politics on Flipboard