How high is too high to drive?

I've only lived here a couple years but that's long enough to hear plenty about the "diving high" debate. Much is written about driving under the influence of alcohol. There are smartphone apps that help you determine if you're over the 0.08% blood alcohol limit. You can do the drink/body weight math to estimate where you're at too. The "too high to drive" question isn't nearly as clear.

Recent research by the AAA Foundation for Traffic Safety, says "there is no scientific evidence that a specific level of THC in a person’s bloodstream is associated with an impaired ability to drive." The report went on to say..." that marijuana can affect people differently and some people with high blood levels of THC may not be impaired, while a person with lower levels may be too impaired to safely operate a vehicle." All of this makes writing effective laws and guidelines for marijuana use and driving a challenge for policy and lawmakers.

Four years into Colorado's recreational weed sales, state officials are closer to understanding how Amendment 64 is impacting Colorado highways but admit they've got a long way to go. 73% of nearly 4,000 drivers charged with DUI in 2016 tested positive for marijuana. That's according to the latest Colorado Division of Criminal Justice report. That proves that smoking weed is part of the impairment driving problem, however that same study also revealed the criminal justice system isn't prepared on how to deal with the current driving high situation. Where does this leave us? We really don't know. The best practice is, if you're high, don't drive.

Credit: The Cannabist