There are 14 billion hamburgers consumed each year in the United States alone. The people who eat those burgers, though, have little knowledge of what's actually in them. Current USDA regulations, for example, openly allow beef contaminated with E. coli to be repackaged, cooked and sold as ready-to-eat hamburgers.
This simple fact would shock most consumers if they knew about it. People assume that beef found to be contaminated with E. coli must be thrown out or destroyed (or even recalled), but in reality, it's often just pressed into hamburger patties, cooked, and sold to consumers. This practice is openly endorsed by the USDA.
But E. coli may not be the worst thing in your burger: USDA regulations also allow chicken feces to be used as feed for cows, meaning your hamburger beef may be made of second-hand chicken poop, recycled through the stomachs of cows.'