When raw chicken has gone bad it will have a very strong potent odor.
If it smells even slightly bad then throw it out. Also if the raw chicken has a slimy feeling then it's bad and needs to go in the trash.
Raw chicken should be thrown out if it's been in the refrigerator for 4 days.
If the chicken was stored in the freezer it can last longer but if the chicken has been in the freezer longer than 4 months then it's likely bad.
If in doubt just throw the chicken in the trash because it's not worth getting sick over and potentially dying over either.
The chicken if it goes bad may also have a smell like bad eggs.