May I eat/utilize food that has been left under a bed where someone has slept?

May I eat/utilize food that has been left under a bed where someone has slept?

Also. does it change matters if the food is covered or enclosed totally ?

It does not matter if it was covered, it must be thrown out.

I have to ask, who puts food under a bed?

Think dormitory where there is limited space for each roommate and they store items in boxes or suitcases under their beds. This is very common in dormitories or homes with limited space. Storing a case of Cheerios under a bed isn’t so far fetched.