It shall be unlawful for any person, firm or corporation to sell, prepare for sale, offer for sale or have on hand for sale any meat or meat-food product which shall contain any substance which lessens its wholesomeness, or any drug, chemical, dye or preservative, other than common salt, sugar, wood smoke, vinegar, pure spices or saltpeter.
Whenever any conviction is sought under this section upon any alleged sample of meat or meat food product, it must clearly appear that the sample of meat or meat food product, it must clearly appear that the sample was taken in duplicate and one of said samples left with the accused or with his agent, servant or employee.