In taking samples of milk or cream from any milk can, cream can or any container of milk or cream, the contents of such milk can, cream can, or container of milk and cream shall first be thoroughly mixed either by stirring or otherwise, and the sample shall be taken immediately after mixing or by any other method which gives a representative average sample of the contents, and it is hereby made a Class 2 misdemeanor to take samples by any method or to fraudulently manipulate such samples so as not to give an accurate and representative average sample where milk or cream is bought or sold and where the value of said milk or cream is determined by the butterfat contained therein. (1951, c. 1121, s. 1; 1993, c. 539, s. 755; 1994, Ex. Sess., c. 24, s. 14(c).)