During the election, the exterior of the voting equipment and every part of the polling place shall be in plain view of the officers of election. No voting or counting machines shall be removed from the plain view of the officers of election or from the polling place at any time during the election and through the determination of the vote as provided in § 24.2-657, except as provided in subsection D of § 24.2-649.1. In the case of an emergency that makes a polling place unusable or inaccessible, voting or counting machines may be removed to an alternative polling place pursuant to the provisions of subsection D of § 24.2-310. The equipment shall be placed at least four feet from any table where an officer of election is working or seated. The officers of election shall not themselves be, or permit any other person to be, in any position or near any position that will permit them to observe how a voter votes or has voted. One of the officers shall inspect the face of the voting machine after each voter has cast his vote and verify that the ballots on the face of the machine are in their proper places and that the machine has not been damaged. During an election, the door or other covering of the counter compartment of the voting or counting machine shall not be unlocked or open or the counters exposed except for good and sufficient reasons, a statement of which shall be made and signed by the officers of election and attached to the statement of results. No person shall be permitted in or about the polling place except the voting equipment custodian, vendor, or contractor technicians and other persons authorized by this title.