Jokes on them. I've worked in food factories for the last ten years. Every ingredient that comes in is labeled kosher. Never once seen a rabbi blessing shit. We go through so much product that you would need a team of 20 rabbis working full time, one at each of our suppliers (on the farm) to keep up. And that's for each factory.  I've heard they get away with blessing the transport trucks once every year, and magically makes everything inside kosher. But I've also heard that they believe 6 gorillion jews were magically incinerated in 4 years.