A supermarket who'd care for their customers, would defeat such shenanigans by instructing their personnel to always put the warning-side visible on the shelves

A supermarket who'd care for their customers, would defeat such shenanigans by instructing their personnel to always put the warning-side visible on the shelves. Such that their customers can't overlook it if present. Of course, most supermarkets are more interested in profit margins, and whatever helps to increase them.