(a) The tribunal hearing an election contest shall attempt to ascertain whether the outcome of the contested election, as shown by the final canvass, is not the true outcome because:
(1) illegal votes were counted; or
(2) an election officer or other person officially involved in the administration of the election:
(A) prevented eligible voters from voting;
(B) failed to count legal votes; or
(C) engaged in other fraud or illegal conduct or made a mistake.
(b) In this title, "illegal vote" means a vote that is not legally countable.
(c) This section does not limit a provision of this code or another statute expanding the scope of inquiry in an election contest.