Did your public schools serve Mystery Meats in the school lunches?

Some school children in Nebraska got sick recently in Nebraska after eating the chili they were served in their school lunches. It was discovered that the chili had been prepared with kangaroo meat, which the school said was purchased from their vendor company "Sysco"....now I'm wondering how much cheaper kangaroo meat is than beef and why they didn't want to come out and tell students that was what was in it before they served it. And what all other meats have been substituted in meals.