http://www.alternet.org/drugs/legal...not-arrested-marijuana-millions-dollars-saved
According to the Colorado Center on Law and Policy, by removing criminal penalties the state has saved anywhere from $12 million to $40 million dollars over the last year. (Others have estimated the state spends over $60 million enforcing marijuana prohibition at the levels now legal, so the CCLP estimate is probably on the conservative side.) Over the last decade, the state has averaged over 10,000 arrests and citations per year for minor marijuana possession at the levels now legal in the state.
Because of Amendment 64 and the simple decriminalization of marijuana in the state over the last year, 10,000 primarily young adults will likely not be hindered by the collateral consequences of a drug charge.