Sanitary

There used to be lots of "sanitary" enterprises: sanitary ice cream companies, sanitary dairies, sanitary tortilla companies. I suppose that sanitary tortillas were those first made by machine instead of patted out individually by hand, although, even so, most simple conveyor lines for tortillas rely on hand rolling, not scooping, of the balls of masa to be mechanically flattened. Did sanitary ice cream companies and sanitary dairies in general rely on milk from cows tested for and known to be free of tuberculosis?