Colorado already has a number of laws in place that prohibit driving under the influence of alcohol or drugs (DUI/DWI), and the penalties that follow a conviction of violating these laws can be severe. With the recent voter-approved changes in Colorado’s marijuana laws, however, the state is considering how to handle marijuana use by drivers.
Unlike Washington, which also legalized the use of small amounts of marijuana in 2012, Colorado law does not currently set a maximum amount of THC that a driver may not have in his or her system while operating a motor vehicle. THC, or tetrahydrocannabinol, is the active ingredient in marijuana. This method is similar to that used in all 50 U.S. states for drunk driving, in which the legal blood alcohol limit is 0.08 percent.