At each polling place, there shall be a sufficient number, as determined by the board of civil authority, of voting booths. Each booth shall be of sturdy construction and shall allow a voter to mark his or her ballot conveniently without having his or her choices observed by any other person. (Added 1977, No. 269 (Adj. Sess.), § 1; amended 1981, No. 239 (Adj. Sess.), § 17.)