The vast majority of Coloradans suspected of driving under the influence in 2016 had been drinking, but only a small fraction had used marijuana, says a first-of-its-kind study of DUI cases published by the state Division of Criminal Justice.
But drug-related impairment likely is under-represented in the data, a state news release says, “due to the fact that alcohol is faster, easier and cheaper to screen for than other drugs. Once alcohol is detected, agencies have enough evidence to reliably achieve a conviction. Therefore, agencies have not consistently spent the additional money and time to request blood testing for substances beyond alcohol.”
More than 91 percent of suspects who had a toxicology screen done had alcohol in their systems, while only 6.2 percent had marijuana, the data show.
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