"It has done nothing more than enhance the opportunity for the black market," said Lt. Mark Comte of the Colorado Springs police vice and narcotics unit. "If you can get it tax-free on the corner, you’re going to get it on the corner."...
Arapahoe County, outside Denver, has seen "a growing number of drug rips and outright burglaries and robberies of people who have large amounts of marijuana or cash on them," said District Attorney George Brauchler.
Elsewhere, prosecutors say, Nathaniel Tallman, 25, was killed during a January drug deal when he was robbed and shot, and his body dumped in Wyoming.
The next month, a dealer mugged three people who were trying to buy marijuana from him in a Denver grocery store parking lot. http://www.sltrib.com/sltrib/world/57777558-68/marijuana-pot-drug-colorado.html.csp
People who smoke pot are just a bunch self indulged spoiled brats. They don't care if they get their pot from a store or from the street corner, they just want their pot.
And many of those people will still act like jerks and some of those will commit crimes, including violent crimes, because they smoke pot.
I am willing to bet that in 5 years or so, Colorado will try to repeal this law after they see what kind of damage it has caused their state.