The Colorado legislature Wednesday approved a pair of bills that will establish a regulated marijuana market for adults. The legislature was charged with doing so when voters approved the marijuana legalization Amendment 64 last November.

On the down side, the legislature earlier approved another bill, House Bill 1325 , which would set a level of THC in the blood above which drivers would be presumed to be impaired. Drivers with 5 milligrams or more of THC per milliliter of blood would be considered to be impaired, but could challenge that presumption in court.

The marijuana regulation bills are House Bill 1317 and House Bill 1318. The former creates the framework for regulations governing marijuana retail sales, cultivation, and product manufacturing, while the latter enacts a 10% special sales tax (above and beyond standard sales taxes) and a 15% excise tax on wholesale sales.

Under Colorado law, the tax bill will have to be approved by voters in November. But three-quarters of Colorado voters support such pot taxation, according a Public Policy Polling survey.

"The adoption of these bills is a truly historic milestone and brings Colorado one step closer to establishing the world's first legal, regulated, and taxed marijuana market for adults," said Mason Tvert, director of communications for the Marijuana Policy Project, who served as an official proponent and campaign co-director for the ballot measure approved by Colorado voters in November. "Facilitating the shift from the failed policy of prohibition to a more sensible system of regulation has been a huge undertaking, and we applaud the many task force members, legislators, and others who have helped effect this change," Tvert said. "We are confident that this legislation will allow state and local officials to implement a comprehensive, robust, and sufficiently funded regulatory system that will effectively control marijuana in Colorado."

Look for an in-depth analysis of the new regulations coming soon.