(1) The list containing the names of persons voting under ss. 6.29 and 6.55 (2) and (3) shall be returned together with all forms and certificates to the municipal clerk.
(2) Upon receipt of the list, the municipal clerk shall make a check to determine whether each person who has been allowed to vote under s. 6.55 (3) is properly registered. If so, the clerk shall correct the registration list. If the address on the registration list is not correct, the clerk shall correct the address. The clerk shall then notify the elector by postcard when he or she is properly registered. If such person is found not to be properly registered, the clerk shall send the person a 1st class letter with that information, containing a mail registration form under s. 6.30 (4) . The letter shall be marked in accordance with postal regulations to ensure that it will be returned to the clerk if the elector does not reside at the address given on the postcard. If such letter is returned undelivered, or if the U.S. postal service notifies the clerk of an improper address which was apparently improper on the day of the election, the clerk shall notify the district attorney.
(3) Upon receipt of the list under sub. (1) , the municipal clerk or board of election commissioners shall make an audit of all electors registering to vote at the polling place or other registration location under s. 6.55 (2) and all electors registering by agent on election day under s. 6.86 (3) (a) 2. The audit shall be made by 1st class postcard. The postcard shall be marked in accordance with postal regulations to ensure that it will be returned to the clerk or board of election commissioners if the elector does not reside at the address given on the postcard. If any postcard is returned undelivered, or if the clerk or board of election commissioners is informed of a different address than the one specified by the elector which was apparently improper on the day of the election, the clerk or board shall change the status of the elector from eligible to ineligible on the registration list and mail the elector a notice of the change in status and provide the name to the district attorney for the county where the polling place is located.
(4) After each election, the municipal clerk shall carefully check to assure that no person has been allowed to vote more than once. Whenever the municipal clerk has good reason to believe that a person has voted more than once in an election, the clerk shall send the person a 1st class letter marked in accordance with postal regulations to ensure that it will be returned to the clerk if the elector does not reside at the address given on the letter. The letter shall inform the person that all registrations relating to that person may be changed from eligible to ineligible status within 7 days unless the person contacts the office of the clerk to clarify the matter. A copy of the letter and of any subsequent information received from or about the addressee shall be sent to the district attorney.
(5) Whenever any letter or postcard mailed under this section is returned undelivered, or whenever the U.S. postal service notifies the clerk of an improper address which was apparently improper on the day of the election or whenever it otherwise appears that a person has voted who is not qualified or has voted more than once in an election, and the person has been permitted to vote after corroboration was made under s. 6.55 (2) or (3) or 6.86 (3) (a) 2. , the name of the corroborator shall also be provided to the district attorney.
(6) The municipal clerk may not disqualify an elector under this section except upon the grounds and in accordance with the procedures specified in s. 6.325 .