(KRON) — Marijuana-impaired driving has been on the rise across the country. According to the National Highway Traffic Safety Administration, the percentage of weekend nighttime drivers who tested positive for marijuana went from 8.6% in 2007 to 12.6% in 2014. However, the NHTSA study pointed out that “the presence of drugs does not necessarily imply impairment.” Just how long … [Read more...] about When is it OK to drive after consuming marijuana?