When pot first became illegal abuse wasn't really an issue, it spread into our communities after the fact through experimentation and jazz among other things such as backlash to the old refer madness movies. It was just a convenient target, a perfect storm type of thing.
We had Hearst with his natural prejudice which was reinforced when Pancho Villa camped on some of his land, Dupont and others who had found ways to do things with synthetics that might be threatened by natural hemp oils and fibers, we had alcohol prohibition just ending and the depression to consider with large numbers of law enforcement facing the loss of employment and needing a reason to be there. It was mostly self interest and prejudice.
Nothing has really changed over time, today we've got private prisons, drug testing and treatment, law enforcement, pharmaceutical interests and a number of others who would be hurt by a change in the status quo. That's what drives it. What real problems we do have from pot are dwarfed by other things we don't seem to care as much about, the potential for problem isn't what drives it. In part, the following is.
http://americanradioworks.publicradio.org/features/corrections/index.htmlThat's an hour long audio documentary with supporting articles and links from American RadioWorks. First segment talks about some of the financial interests, in particular The American Legislative Exchange Council, or ALEC for short which is an angle worth looking into more. The laws are shaped by those with profit motives, not by those with social motives backed by research and results. That's why the system looks like it does today. I'd love to let science and results into the issue, when that happens legalization and regulation wins.
The other supporting players such as MADD mean well no doubt but they are just being used and to a large extent fed drug war lies to repeat. Them I don't blame so much, they don't know better. Blame the ones that do and look to the bottom line anyway.