They cut everything on the same cutting board, raw chicken and tomatoes for a salad go on the same board that is simply wiped after use, so you know, don't order anything that doesn't get cooked.
Also they undercook everything, so don't get chicken.
One time I asked for water, and the guy who was cutting raw chicken didn't wash his hands before getting my water, so my glass had raw chicken and marinade juice on it. It was really gross.
Pretty much you can only safely eat eggs, toast, and fries. Everything else, at your own risk.
It survives because it's the only 24 hour restaurant in the area, but if another one opened up nearby it'd be out of business in a week.