My general rule: if it stinks, throw it out; if it's green and didn't start that way, throw it out; if it looks "slimy" as opposed to greasy, throw it out!
Common sense comes into play - if you can't remember when you cooked them - throw them out!
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker