Wisconsin Statutes Crimes (Ch. 938 to 951) § 941.31. Possession of explosives

(2)(a) In this subsection, “improvised explosive device” means a destructive explosive device capable of causing bodily harm, great bodily harm, death or property damage; with some type of explosive material and a means of detonating the explosive material, directly, remotely, or with a timer either present or readily capable of being inserted or attached; which may include a pipe or similar casing, with the ends of the pipe or casing capped, plugged or crimped, and a fuse or similar object sticking out of the pipe or casing; and made by a person not engaged in the legitimate manufacture or legitimate use of explosives, or otherwise authorized by law to do so. “Improvised explosive device” does not include ammunition for any rifle, pistol or shotgun.

(b) Whoever makes, buys, sells, transports, possesses, uses or transfers any improvised explosive device, or possesses materials or components with intent to assemble any improvised explosive device, is guilty of a Class H felony.

(c) This subsection does not apply to the transportation, possession, use, or transfer of any improvised explosive device by any armed forces or national guard personnel or to any peace officer in the line of duty or as part of a duty-related function or exercise. The restriction on transportation in this subsection does not apply to common carriers. Notwithstanding s. 939.22(22), this paragraph does not apply to a commission warden.