§ 609. Examination of animals and food products thereof, slaughtered and prepared during nighttime
The Secretary shall cause an examination and inspection of all amenable species, and the food products thereof, slaughtered and prepared in the establishments hereinbefore described for the purposes of commerce to be made during the nighttime as well as during the daytime when the slaughtering of said amenable species, or the preparation of said food products is conducted during the nighttime.