I honestly don't view any animal as being "off limits", in the end we are all just just meat and bone and hair, the only differences are the ones humans choose to create.
That being said, parasites and or medications are a serious concern, so I personally wouldn't do it based on this fact alone. My uncle used to feed his Burmese roadkill, he would freeze it for a few weeks then thaw and feed and had no issues with parasites, but I don't think I would want to risk it, since many bacteria can survive that.