SDCL § 12-16-26: Construction of ballot boxes--Openings.

Ballot boxes shall be so constructed to preclude the removal of any material therefrom except by means of an opening which may be secured in the closed position by means of a metal seal which will preclude opening of the box without the destruction of the seal; materials used in the construction of ballot boxes shall be such that they will prevent tampering with or mutilation of ballots within them. There shall be a second opening in each such ballot box, at the top when the box is upright, not larger than is sufficient to admit a single closed ballot to be inserted therein at one time.