Mo. Rev. Stat. § 196.480: Requirements before issuance of license.

No locker plant shall be licensed if located in insanitary, unclean or contaminating surroundings which might endanger public health, and all rooms and equipment of a locker plant shall at all times be maintained in a clean and sanitary condition consistent with the purpose for which such rooms and equipment are used. Locker plants shall have ample and sanitary water and toilet facilities. All employees handling food shall have an approved health certificate.