An objection to the qualifications of a voter, except for an objection to a voter who should have been removed from the voter registration rolls pursuant to R.S. 18:173, or to an irregularity in the conduct of the election, which with the exercise of due diligence could have been raised by a challenge of the voter or objections at the polls to the procedure, is deemed waived.
La. R.S. § 18:1434