A couple things come to mind, the first being my recollection that the growing of Hemp in Canada is a tightly regulated and permitted pursuit. I also recall being told that only one or 2 specific strains of the plant are allowed to be cropped, and the seeds must come from the government.
Another thing that comes to mind is how the current government of the US, since the 1930s, has abused the Constitution. 9 of the 10 amendments known as the Bill of Rights have been abrogated, and no court in the land will grant standing to anyone to sue under the 10th. Virtually all drug laws are clearly beyond Constitutional. It would be hard to argue the Constitutionality of any drug law.
Drug laws are a matter of convenience for the government to exercize control of the population than anything else. On top of that, Drug Laws provide a lot of cash, and cash has been known to change hands. Naturally, I'd never suggest any politician has ever benefited from drug money. Bill Clinton didn't know he was having his picture taken with a major drug lord. I believe Bill, he has a proven record of truth telling.
Since I went to school many decades ago, I learned of something predating the formation of the US, and the Constitution called the Mayflower Compact. Supposedly, a lot of our society is based upon that document, and it's basic premise, "You don't work, You don't eat". I'm also old enough to remember the pre LBJ times where people actually worked, or went hungry. Hunger is an excellent inducement to work. LBJ gave the lazy a walk down easy street, and go tthe ball rolling for a lot of PC domestic reforms, including, but not limited to, AFDC.
The Government is my shepard, I shall not want, seems to have become the way of life for a great many people in our society, we are now well into the 3rd if not 4th generation of AFDC "familys". The US population has been deincentivised, and egalotarianism has been declared insensitive to the underprivilidged. The underprivilidged in the US live at a higher standard of living than the working class in most of the world.
Sadly, these poor bustards living on the doll have no daily activity to fill their sorry lives, beyond cable TV and breeding, so they must have a financial stipend to fund their other needs. I understand one can only convert Food Stamps to cash at a certain loss, so they very often vend certain unlawful substances. Oddly, many of those on the doll seem to engage in more commerse than a neighborhood store.
Given the sorry condition of US government education, it's hardly surprizing these folks feel they are doing nothing wrong. They are conditioned on a daily basis to believe there is a drug for every malidy by their social guidance system, Cable TV. If you have any doubt, watch 1 hour of commercial television, and list the products the commercials are pushing in that hour. We have a pill for everything in the US, from the inability to erect, to acne, and toenail fungus. From the day a kid enters the government school system, they see teachers and administrators pushing the drug that makes the system's life easy, Ritalin. It's hard to wonder why 2nd graders are confused about drugs.
Is the current system working? NO! Is any system in the world working? I doubt it. It is the nature of humans to seek intoxication, and it is in the nature of humans to seek to better their circumstance. Malum Prohibitum laws regarding drugs are doomed to fail by nature.
The history of US attempts to prohibit drug use is and always has been a history of foolishness, and power grabbing. If the link works, it is some very interesting reading, and factual.
http://www.mcwilliams.com/books/aint/303a.htm