It would seem to me that the drug task force hell bent on going after simple marijuana users is what is costing the taxpayers money. I think this problem, however is seperate from medical marijuana use. My feelings about recreational and social use of marijuana are aside from my feelings about medical use of marijuana.
Regarding recreational use, I would much rather see a bunch of pot heads wandering the streets on a Friday night than a bunch of drunks. I don't think I have ever heard of a lethal overdose of marijuana, but I have heard countless sad stories about people dying from binge drinking. Part of the reason that marijuana remains illegal for recreational use is because the government can't stop lay people from growing it for themselves, and the tobacco and alcohol lobbyists who line the pockets of the politicians will see to it that this does not change, as long as the United States continues to elect their leaders with money and advertising.
Similarly, the drug companies will ensure that their synthetic Marinol remains on the market for cancer patients while the real, natural, simple grow-it-yourself product remains illegal and out of reach for most individuals. Additionally, I would much rather see fewer Oxycontin addicts out there overdosing and lying and conniving ways to get physicians to prescribe these medications than patients using medical marijuana to ease their own suffering.