81-22-401. Grading of milk -- condemnation of unsafe milk. Except for milk or cream sold as homemade food or a homemade food product pursuant to Title 50, chapter 49, part 2, milk or cream purchased for use in milk plants or for use in a manufactured dairy product in this state must be graded by licensed graders, weighers, and samplers. It is unlawful to sell, purchase, or use milk or cream for a food purpose if the milk or cream is found to be musty, adulterated, rancid, dirty, with marked undesirable odors or flavors, or to contain foreign objects, fragments, substances, or excessive bacteria. The milk or cream grader or the department shall condemn the milk or cream and may add to the milk or cream a nontoxic coloring substance or rennet and return it to or leave it with the producer with an explanation of the cause for rejection.