pretty sure that's the case in the places where it has already been decriminalized or legalized outright; plus, it frees the resources and manpower that departments and agencies devote to the heinous crimes of weed possession and use.
the police, on the other hand, would lose easy targets to detain, abuse, harass, beat up, or shoot, all while hiding behind the flimsiest excuse and the easiest lie of 'i smelled weed', and enjoying the benefits of qualified immunity that comes from such claims.
They won't be able to pull over random black people because 'they smelled marijuana', and obviously every one of those was on their way to commit a crime.
No they can't use that excuse, because the cops are already faking fentanyl overdoses after "smelling" it and having panic attacks because they don't actually know shit about it and believe their own propaganda.
Ha — I attended a neighborhood meeting several months back where a policeman spoke, and described a bust where he'd "smelled fentanyl." It's amazing how much they don't know.
I never really heard of police/crime incidents in my hometown involving weed before or after weed became legal in Washington. So I'd assume there really hasn't been a noticable change, which is still better than the fear mongering that crime will increase upon legalizing weed.
In illegal times and places, getting busted for weed is/was so common it only made the news when celebrities are/were caught. Can't much speak to the here and now, but I grew up in (suffice to say) an earlier decade of the illegal era, and dope busts were incredibly common.