The quickest and easiest way to tell if pork is bad is by trusting your unfailing sense of smell to see if it has an acrid, tart odor, even acidic.
Pork should never smell ‘off’ if it is safe to eat. If it doesn’t smell edible, it probably isn’t. Cooking expired meat will almost always intensify the unpleasant aroma coming off the spoiled pork.
With raw pork the number one giveaway, as said above, is the odor it gives off. Raw meat should not smell like rotting meat and the distinction is very easy to notice.
Cooked meat can often be quite a bit harder to decipher than raw meat because the signs begin to become a bit harder to make out when the meat has already been prepared.