You've mentioned supermarkets.....one of my favorite places to gripe about! I can't stand seeing shoddy practices where food is sold.
I'm responsible for a Stop Sale Order on several hundred dozen eggs one Easter, when I found awful chicken droppings in carton after carton. Who knew that our county had a special egg inspector? 
I also blew the whistle to the dept. manager, the store manager, AND the health dept. when, two weeks in a row, I could place my hand directly on the surface of the hot table where rotisserie chickens were sold. That meant the temp. had to be 100 degrees or less, nowhere near the safe range. Twice I made them pull an entire cart full of chickens off that table. First they claimed that someone had turned the heat off, then they said maybe it wasn't working right. They really didn't seem concerned, though, taking their good old time to have a look. I actually had to stand there myself & warn people not to buy a chicken while they poked around trying to find a thermometer. That prompted me to call the health inspector, and the table's been piping hot ever since. I'm sure he had a dandy visit due to my call. 
I found outdated OTC medicine @ my drug store recently, and called the local office of the FDA. They have inspectors who do nothing all day but go to stores to check dates and pull merchandise if needed. They oversee all OTC meds & infant formula. 
Sorry, but I just can't keep quiet
when I see something wrong in a store....especially not when someone's health is at stake.