Millions of dollars have poured in as tourists from around the world have come to get high in Denver.
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.