California Code, Penal Code - PEN § 593a

(a) Every person who maliciously drives or places, in any tree, saw-log, shingle-bolt, or other wood, any iron, steel, ceramic, or other substance sufficiently hard to injure saws, knowing that the tree is intended to be harvested or that the saw-log, shingle-bolt, or other wood is intended to be manufactured into any kind of lumber or other wood product, is guilty of a felony.

(b) Any person who violates subdivision (a) and causes bodily injury to another person other than an accomplice shall, in addition and consecutive to the punishment prescribed for that felony, be punished by an additional prison term of three years.