There are several places selling resin handcuff keys and shims and ceramic razor blades for "E&E" purposes. For a while there were limitations like, "only available to law enforcement and military customers" but now it seems like these are wide open to the general public.
Obviously we're all good guys here who would only use these in justifiable instances of civil disobedience (or to avoid public urination charges). My concern is that one of these will find its way into the hands of a bad guy, and that people will be hurt as a result.
Here in Durham, a kid committed suicide in the back seat of a police cruiser a few months ago. These escape tools make incidents like that more likely.