The following words and terms, when used in this section, shall have the following meanings, unless the context clearly indicates otherwise. (1) Accredited Veterinarian--A veterinarian jointly approved by the Executive Director of the Commission and the Administrator of APHIS, to perform functions required by cooperative State-Federal animal disease control and eradication programs. (2) Adjacent herds--A herd of livestock or exotic livestock that occupies a premises that lies within one mile of "an affected herd." (3) Affected herd--A herd of livestock or exotic livestock in which there is strong and substantial evidence that Mycobacterium bovis exists. This evidence should include, but is not limited to, any of the following: histopathology, polymerase chain reaction (PCR) assay, bacterial isolation or detection, testing data, or epidemiologic evidence such as contact with known sources of infection. (4) Approved feedyard/approved pens--A confined area, either the entire feedyard or designated pens within the feedyard, jointly approved by the Executive Director of the Commission and the Administrator of APHIS for feeding of restricted livestock and exotic livestock. Biosecurity standards, to include requirements for geographic separation, shall be enforced to prevent potential spread of diseases to other livestock on the premises and adjacent premises. Procedures for accountability of inventory, animal identification, and movement control shall be enforced to ensure that restricted livestock and exotic livestock remain within approved facilities until verification of slaughter. (5) Approved livestock facility--A stockyard, livestock market, buying station, concentration point, or any other premises under State or Federal veterinary supervision where livestock are assembled and that has been approved under