Iowa Code Title V. Agriculture [Chs. 159-215A] § 194.5. Frequency of tests

A test shall be made on the first purchase of milk from a new producer and at least once within each thirty-day interval thereafter. One lot of milk from each producer shall be selected at random and tested for extraneous matter by an appropriate method. The secretary shall determine and promulgate the standards and methods of testing the milk for extraneous matter. The method and standards shall be no less strict than those recommended by the agricultural marketing service, U.S. department of agriculture.