Sour, rotten, or ammonia-like smell
Slimy or sticky texture
Gray, green, yellow, or dull discoloration
Packaging swollen, leaking, or damaged
Chicken feels unusually tacky or mushy
Strong off odor even after opening
Visible mold or unusual spots
Past the use-by or expiration date
Left unrefrigerated for more than 2 hours
Left in temperatures above 40°F for too long
Excessive liquid with a bad smell
Texture that is dry on the outside but sticky underneath