Yosef Karo

“ If one slaughtered a bird or a wild animal and then slaughtered a domesticated animal on top of it he is exempt from covering the blood, but if he slaughtered a domesticated animal and then slaughtered a bird or a wild animal on top of it he is obligated to cover the blood. ”

“ One who slaughters a wild animal does not cover [the blood] until he checks the lungs, and if he finds a questionably invalid signs, he covers without making a blessing. And this is the law for all invalidations that arise from a questionable status, for example that [case] where we're worried that maybe [the knife] became notched while [cutting] the skin, and so too all similar cases. ”

“ And so too, if a deaf person or a mentally challenged person or a child slaughtered and there was no one watching them, there is an assumption that the they had a botched slaughter and it is exempt from being covered. ”