Idaho Code § 18-7021
Every person, not the owner thereof, who wilfully mars, disfigures, breaks or otherwise injures, or molests, removes or destroys, any work of art, monument, landmark, historic structure, shade tree, shrub, ornamental plant, or useful or ornamental improvement, is guilty of a misdemeanor.
[18-7021, added 1972, ch. 336, sec. 1, p. 978.]