The study didn't include data from 2014, when recreational marijuana shops opened.
The complaint alleges that Colorado's Amendment 64 runs afoul of federal law.
CPR's regular interview with Gov. John Hickenlooper covered TABOR refunds, how to make housing more affordable and "disappointing" news about the state's health exchange.
The actual number of marijuana arrests last year at DPS is double the number provided earlier, while the percentage increase over the previous year was scaled back to 6 percent.
The state is preparing to give away millions of dollars in grants for medical marijuana research, including to study whether marijuana helps ease the symptoms of psychological trauma in veterans.
From Seth Rogen to Tommy Chong to Whoopi Goldberg, more celebrity names are going to pot.