(2) A challenge to a ballot of a person offering to vote shall be made under oath or affirmation before the clerk and shall be in writing on a numbered challenge form. The statement shall contain the name and residence address of the challenger, the name of the person challenged and a statement of the facts upon which the challenge is based. Any elections official may administer the oath or affirmation required under this subsection. [1985 c.808 §32; 1999 c.410 §37; 2007 c.154 §18; 2013 c.520 §16]