(a) The clerk of the political subdivision shall, on the request of any person, check each name on a petition to determine whether the signer is a registered voter of the district. A person requesting verification by the clerk shall pay the clerk a sum equal to 20 cents for each name before the verification begins.
(b) The clerk may not count a signature if the clerk has a reason to believe that:
(1) it is not the actual signature of the purported signer;
(2) the voter registration certificate number is not correct;
(3) it is a duplication either of a name or of handwriting used in any other signature on the petition;
(4) the residence address of the signer is not correct; or
(5) the name of the voter is not signed exactly as it appears on the official copy of the current list of registered voters for the voting year in which the petition is issued.