LINKEDINCOMMENTMORE

(KMOV) During a test conducted in Washington state, three people smoked marijuana, then went out on a driving course.

None of the drivers were able to avoid the cones. For one of the drivers, the driving instructor had to grab the wheel when they headed off the course.

Advocates say marijuana affects people differently, so simply setting a THC limit is not necessarily the best indicator of how impaired someone might be.

Read or Share this story: http://www.wcnc.com/story/news/health/2014/07/02/10977044/