1. Crime rates reduced: I mean, of course they did. It was not longer a crime to be using those drugs, so there was no reason to be arresting people for possessing them. I don't know about you, but that seems pretty simple to me.
2. HIV rates reduced: I remember reading something once upon a time ago that made mention about how HIV rates plummeted all around the world (except in Africa) during that same time frame. Yet the rest of the world definitely hasn't decrimed/legalized all drugs. Might be worth looking into that more and see if maybe Portugal just had a happy coincidence.
>> Link: Not what I read, but shows some of the same or similar data I remember. https://www.kff.org/global-health-policy/fact-sheet/the-glob....
3. Overdose deaths: Strangely enough with humans, once something is no longer illicit, they want it less. They are also less likely to overdose on said drugs because they aren't having to risk a bad batch from a bad dealer as much, that sort of thing. So this is a win for legalization, I must admit; but it's a pretty loose one, since the whole "can't have it, thus want it" effect is pretty strong with humanity. Not having it anymore cause they can have it could be part of this reduction. Needs more looking into. (I would hope that before downvoting, people would look into things like the reduction of marijuana use among some people because it was no longer against the law, thus 'cool' to be a user of marijuana here in Canada and I think some American states as well. This applies to basically any drug due to how human psychology operates.)
4. I think most of those reductions are going to have more to do with happy coincidences, and the conjunction of rehab use, since the use of said drugs isn't as socially stigmatized anymore, thus neither is rehab.
(Edit: Look, folks. I get it, some of you really don't like what I have to say here. That's fine. But please, give me a break. I'm a new person here, and I'm just trying to add context to the conversation. Thanks for understanding, hopefully.)