I seldom eat out. When I worked at a forensics hospital, heard from some of our patients who worked at restaurants and fast food places the things they added to food..mostly saliva, and urine.
Back in the 80s I had a roommate that had worked in the kitchen of a very nice steakhouse and later became a plumber....both employment opportunities offered a unique look into restaurant kitchens.
He told me “make no mistake it doesn’t matter if it’s McDonald’s or Ruth’s Chris....you don’t want to know what goes on in those kitchens.....if they drop food on the floor you better believe it goes back on the plate to be served.
One of the reasons I go out of my way to NOT tick off the wait staff, at least until after I get my food....and if it’s a place I frequent and they know me I keep my mouth shut.