Sour, rancid, or ammonia-like smell
Slimy, sticky, or tacky surface
Gray, green, brown, or dull discoloration
Mold growth
Package is bloated, leaking, or damaged
Meat feels unusually soft or mushy
Off or unpleasant taste
Past the use-by date
Left unrefrigerated for more than 2 hours
Left out for more than 1 hour in hot weather
Freezer burn with severe dryness or off odor after thawing
Visible spoilage around edges or throughout the steak