Well the US spends 80 billion + a year on prisons, so take 1/2 of that and make inpatient rehabs that treat drug addiction.
First of all, if you legalize it, then few are even going to get rehab. We know this because look at California. They don't hardly enforce drug laws, there are drug addicted people all over the streets.
Legalizing it, just means they'll be shooting up, strung out, and pooping in your yard. Or even attacking people.
Secondly, I'm not sure what the Federal Government has to do with this. If Mayor Pete wants to setup a drug rehab program in his city, I'm all for it. Do whatever you want.
Why is the Federal Government being involved in this? The Federal Government should leave drug enforcement and such, to the states.
That said....
As it relates to drug rehab, I need more evidence. Specifically, I would like some state, or city, to fund and run their own drug rehab program, and lets actually see how it works.
My issue is, for many different addictions, the relapse rate is exceptionally high. My concern, is that you are going to spend millions on rehab for these people, and have a relapse rate of over 60%.... because we've seen relapse rates of over 60% in many of these situations.
And when you have a relapse, you end up with them in prison anyway.... except you have already spent millions giving them treatment.
The way you have success requires the willingness of the individual. Just look at the 12-step for alcoholics anonymous. What's the very first step? First step, before anything else, is admit you have a problem, and that you need help.
Why? Because until the individual admits their drunkenness is a problem.... and that they need help.... AA knows that nothing they do can help that person. Nothing. Until the individual himself, or herself, admits that their drinking is a problem, and that they need help to get out of it.... nothing else matters. AA knows this. They know this from decades of experience. For almost 100 years now, they know that without that first step, nothing will help these people.
And I would submit to you, that it is exactly because of that, that forced rehab doesn't work. That's why you have a 60% relapse rate. And I actually believe that number is low. That is only the number that they know relapse, and only the ones they know relapsed in the time frame of the data. The guy whose back on drugs the day after the data is collected, didn't relapse, and neither did the guy who hasn't been caught.
Simply put, these people pushed into rehab, some don't believe they have a problem, and some don't think they need help. They are just taking rehab to avoid being in prison, at a huge cost to tax payers.
I think most of these people, if they believed they had a problem and needed help, they would have been in rehab, before they were ever in the court system.
That isn't to say we shouldn't investigate your idea, I'm all for it. But before we screw over the entire nation by making a bad national policy, I want to see at least one state running this program for 5 to 10 years.