'Presumably, these figures came from the "National Highway Traffic Safety Administration, Fatality Analysis Reporting System (FARS) 2006-2011 and Colorado Department of Transportation 2012-2017," cited in a previous graphic.
'But CDOT's digits, which we shared last month, are completely different. They show that the number of fatalities involving a driver who tested positive for 5 nanograms or more of Delta-9 THC, the highly controversial state limit for cannabis intoxication, actually dropped from 2016 (52, or 13 percent of total drivers involved in fatalities who were drug tested) to 2017 (35, or 8 percent.)
'[...] plenty of other studies contradict the Rocky Mountain High Intensity Drug Trafficking Area's findings, too [...]'
CDOT (your link)
“Marijuana and driving is still a huge problem in Colorado,” Cole maintains. “About 10 percent of our fatalities involve a driver who was at or above the legal limit for active THC, and we need to get that number way down. Any fatality above zero is one fatality too many.”
“number of fatalities involving a driver who tested positive for 5 nanograms or more of Delta-9 THC, “
Maybe the limit is too high?