I was eating at a buffet restaurant in the Chicago area a few years ago and found a plastic bristle in my salad. Called the manager over, gave it to her, she had a look of "yukk" on her face and walked away with it. That was it, nothing said.
Last year found a live bug walking in my chopped salad at a "Subway" store located in a big off road gas station. Got the same response from the young woman who prepared the salad. It's a sad world we live in