The number of people arrested in Larimer County on charges of driving while under the influence of marijuana rose 36 percent last year.
The department in 2015 charged 177 people with DUID and 135 of them were suspected of using marijuana, according to a news release.
In 2014, 91 of the 130 people charged with DUID were suspected of being high on weed.
The sheriff s department said the overall number of people it arrested for driving under the influence or driving under the influence of drugs fell slightly to 625 in 2015 from 665 in 2014.
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Investigations in drugged driving are more time consuming, which takes deputies off the road. That may account for the overall drop in arrests, the department said.
Last week, the Colorado State Patrol reported its troopers on allegations they were driving under the influence of marijuana last year than in the previous year.
It was the first year the state patrol had year-to-year comparisons since recreational marijuana became legal in 2014.
The state continues to work to and what it means to be high while driving.
Last year, the State Patrol began to help troopers detect whether drivers are too high to be behind the wheel.
Noelle Phillips: 303-954-1661, nphillips@denverpost.com or @Noelle_Phillips
