I heard that Jesse Jackson admitted that when he was young and worked in a restaurant, he would spit in the food of white people. With race relations where they are now and the general lack of common decorum in society, I bet this happens a lot more often than most people would think and I’ve cut way back on eating out for this reason alone.
I think that's a safe bet, and I've done likewise. I never go to fast food restaurants. And I'm wary of this stuff everywhere.