Sour, rotten, or ammonia-like smell
Slimy, sticky, or tacky surface
Gray, green, or dull brown discoloration
Mold or fuzzy spots
Package is swollen, leaking, or badly damaged
Meat feels unusually soft, mushy, or dry in a bad way
Off taste after cooking
Past the use-by date and stored improperly
Left out at room temperature for more than 2 hours
Frozen pork chops with severe freezer burn, odd odor, or discoloration after thawing