It shall be unlawful for any person to deface or destroy any signs, signposts, guideposts, or any inscription on them, or facilities erected by or under the direction of the board, a director of highways, county, or highway district commissioners. Any person found guilty shall be deemed guilty of a misdemeanor. The defacing or destroying of each sign, signpost, guidepost, or inscription, or facility shall constitute a separate offense.
Idaho Code § 40-2311