Thought some people might find this interesting:
http://www.mercurynews.com/saratoga/ci_19385037
"The U.S. Drug Enforcement Agency and state regulators say druggies can use the single ingredient in [Bob Wallace's] "Polar Pure" water purifier -- iodine -- to make crystal meth."
"Wallace said the new rules ordered him to pay a fee, get permits, and keep track of buyers. But his iodine distributor -- warned by the DEA -- won't sell to him."