Of course, this marvelous protective system can be overwhelmed by very dirty conditions. That is why we do not recommend raw milk from confinement dairies, or raw milk that is produced under unsanitary conditions. Raw milk producers have a responsibility to produce raw milk in the cleanest possible conditions. Cows should not be allowed to wallow in mud and muck; they should be well fed; and all equipment washed and stored properly. We strongly advise all raw milk producers to be members of the Raw Milk Institute (RAWMI) and to implement their guidelines for safe raw milk practices.