Ok this is some weird math
Based on records from other states, JLARC found that decriminalization could be expected to reduce marijuana arrests by about 60 percent and that legalization would reduce them by 84 percent.
So even legal there will be arrests 16% of the time?
almost, but not quite:
say an area (a city, a state, whatever) currently experiences 100 weed-related arrests a year. if they were to decriminalize, they could expect that number to fall to 40/year, and with legalization it would be 16/year.
wait, you can be arrested for weed in areas where it's legal? indeed you can. just like you can be arrested for alcohol even if it's legal: where you consume it, how old you have to be, did you cause an accident and adit to consumption, how much you have in your possession (only applies to weed), etc.