Originally Posted by Skippy

Can't Know seems to know. I have a pretty cold fridge, so it can take several days for a good sized chunk of frozen meat to thaw. If the meat doesn't look or smell bad before cooking, it'll probably be fine after thorough cooking. If it looks or smells not right, you're probably better off tossing it. Remember that we lived for thousands of years before refrigeration, and many people across the world still do. Sight and smell are still pretty good for figuring out if food is spoiled or not.