Section 28

Where food in connection with which there is a contravention of any provision of this Act or any regulations made under this Act is sold in an unopened package, any person who appears from any statement appearing on the package or attached to the package to have imported or manufactured or prepared the food or to have enclosed it in such package, or to be the owner of the rights of the manufacturer or packer, or to be the agent of any of them, shall, unless the contrary is proved, be deemed to have so imported, manufactured, prepared, or enclosed the food in the unopened package and shall be liable to the same penalty as if he had actually sold the food in such package.