Sour, rotten, or ammonia-like smell
Slimy or sticky texture
Gray, green, or brown discoloration
Dry, tacky, or unusually dull surface
Mold growth
Package is bloated, leaking, or damaged
Past the use-by or sell-by date
Meat feels soft, mushy, or unusually tacky
Off taste after cooking
Visible signs of spoilage or contamination