What do KFC stores do with leftover chicken?

I’ve always wondered how big fast-food chains handle food waste, especially places like KFC.
For anyone who has worked there (or knows someone who did):

What actually happens to leftover chicken at the end of the day?

Is it thrown out? Reheated? Donated? Made into something else the next morning?
I’m curious how strict the rules are and what really happens behind the scenes.

Would love firsthand experiences or insider stories.