This is going to be a very brief post. In doing some research, I have realized that milk inspection is a good example of government cooperation in Missouri. (I say “realize” instead of “learn,” because I was aware of this program when I worked for St. Louis County.) Anyway, the Missouri Dept. of Agriculture handles milk inspections for most of the state, but it contracts with the Springfield / Greene Co. Health Dept. to do the work in Southwest Missouri, and with the St. Louis Co. Health Dept. to do the work in parts of eastern Missouri. This is nothing groundbreaking — just a small example that I wanted to bring to your attention of how shared provision of government services can (presumably) save tax dollars.
And, yes, you should be allowed to sell raw milk in Missouri, provided it is clearly marked as such.