I found this link in my inbox (which has been sitting unread a lot lately)
Looks like a UK issue, at the moment, but prolly be a good idea for all gardeners to be aware of this.
Aaaaaarrgh! That makes me so mad! Don't eat vegetables grown with manure, but it's okay to eat the meat or drink the milk of the affected animals?!?
Hell, the whole damn thing pisses me off. I can't understand why producing that poison isn't criminal.