It turns out that there’s no real correlation between having drug addicts on the streets and the level of drug use in the area or even mental illness. Unemployment doesn’t even predict homelessness, and neither does weather, or laws pertaining to the homeless.
By far, the best predictor is housing affordability and availability.
It says it doesn’t matter either way, so they are wrong (if they win, it won’t help), but also irrelevant.
I think that partially motivated the study. Climate also doesn’t seem to matter, neither does hiring more police, or really anything politicians have funded in the last decade.
Reduce, yes, but it's not a magic bullet. Many opioid deaths are from people taking pharmaceuticals in precisely measured doses, often in conjunction with other drugs. Others are from people who misjudge their tolerance after extended breaks, such as after relapsing.
Regardless, it's an entirely separate discussion than the problem in the main article: Increasing availability of drugs will worsen the societal problems in places like Portland.
I suspect increased availability of drugs would also lead to more deaths from polydrug abuse. People who normally take one drug might be more tempted to start mixing drugs if it's as easy as picking up some extra pills at the drug center down the street.
Having traveled to Portland recently and witnessed the public drug problem first hand, I have no idea how anyone would think that increasing availability of the drugs would improve the situation.
The only thing legalization and widespread availability would help is reducing deaths from tainted drugs. While that is a significant problem, anything that increases the availability and reduces the price of a drug addiction will also fuel drug use among the public. I've heard people try to argue the inverse, but removing penalties, decreasing prices, and improving availability simply cannot do anything other than increase consumption.