(1) At least 4 times in 6 months, at irregular intervals, a sample of each producer's milk must be tested for antibiotic residues. When a producer's milk shows a positive test, he must be immediately cut off from all markets. He may not be reinstated until a subsequent test of the producer's milk is negative.

(2) Composite milk samples must be tested for biologically significant radionuclides from selected areas at a frequency which the department determines to be adequate to protect the consumer.

(3) Composite milk samples must be tested for pesticides from selected areas at a frequency which the department determines to be adequate to protect the consumer.