A sealed ballot box used under this subchapter must be equipped with a lock to prevent opening the box without a key and designed and constructed so that:
(1) the ballots can be deposited and delivered without damage that will render them unfit for processing in automatic tabulating equipment;
(2) the box can be sealed to detect any unauthorized opening of the box; and
(3) the slot used by voters to deposit ballots can be sealed to prevent any unauthorized deposit in the box.
Official text of the Texas Election Code as published by the Texas Legislative Council.