(a) To be eligible to serve as a watcher, a person must be a qualified voter:
(1) of the county in which the person is to serve, in an election ordered by the governor or a county authority or in a primary election;
(2) of the part of the county in which the election is held, in an election ordered by the governor or a county authority that does not cover the entire county of the person's residence; and
(3) of the political subdivision, in an election ordered by an authority of a political subdivision other than a county.
(b) In addition to the requirements of Subsection (a), to be eligible to serve as a watcher, a person must complete training under Section 33.008.