SkyRock's post pretty much outlines why "weed" is illegal. All tho the racial tensions between Latino and white, were spread from California through Texas because of the Illegal immigrants/migrant farm worker "problem", not just California. Also The African American population was targeted for yet more discrimination, because those evil, jazz musicians, who smoked up, would lure white women away from their husbands for indecent and immoral purposes.
It is a dang weed, it will grow anywhere with dirt, sunshine and water. It "was" in the Pharmacopia as an analgesic and intoxicant. Before a bureaucrat (Anslinger), wanting to hold on to his job/please his masters, had it ripped out as a "Dangerous" drug, by sneaking a bill past Congress. We already have the laws/policies in place to handle people driving, or showing up to work intoxicated, why would this be any different than alcohol? I'm sure that the prohibition has worked, just like it did with alcohol back in the thirties. We all know that the prohibition on alcohol, strengthened organised crime, and we all know how well that "worked".