New York Codes, Rules and Regulations
Title 1 - DEPARTMENT OF AGRICULTURE AND MARKETS
Chapter I - Milk Control
Subchapter B - Milk Control Orders
Part 21 - Western New York Milk Marketing Area-official Order No. 127
Classification of Milk
Section 21.33 - Responsibility of marketers and the reclassification of milk

(a) All skim milk and butterfat shall be Class I milk unless the marketer who first received such skim milk and butterfat, including that diverted as pool milk or otherwise moved to any other plant, satisfies the commissioner that such skim milk and butterfat should be classified otherwise.

(b) Any skim milk or butterfat shall be reclassified if verification by the commissioner discloses that the original classification was incorrect.