It seems cocaine has been behind a rash of flesh-eating disease outbreaks in Los Angeles and New York. Cocaine cut with the veterinary drug, levamisole has apparently been linked to a number of cases of rotting flesh, according to Good Morning America. While the cases reported thus far have been on the coasts, officials have warned that it could very well be a nationwide problem.
Link
Since it's a recreational drug - they'll do nothing (at least until enough congressmen, senators, their children or their mistresses start having parts fall off, then they'll get involved).
and this is only the beginning ......
And, how can the FDA get on a substance that isn't legal or regulated? How would they do anything about it?
Solution: Get a better dealer.
The Stranger (an awesome alt paper in Seattle) has done an excellent series of articles on Levamisole-tainted cocaine.
Below is a link to one of the articles. They also have articles on where to get levamisole test kits and how to make them yourself.
http://www.thestranger.com/seattle/the-mystery-of-the-tainted-cocaine/Content?oid=4683741