Iowa Admin. Code r. 571-114.11
Live traps such as box traps and leghold traps should be used whenever possible. Humane traps, which are those designed to kill instantly and which have a jaw spread exceeding eight inches, are unlawful except when placed entirely under water. All traps and snares, except those that are placed entirely under water, shall be checked once every 24 hours. All traps and snares for the taking of nuisance wildlife shall have a metal tag attached that is plainly labeled with the permittee's business name and address. If traditional capture methods fail, the permittee may use chemicals, smoking devices, mechanical ferrets, wire, tools, instruments, or water to remove nuisance animals in accordance with the procedures contained in the guidebook. No person, except a person acting under an NWCO permit, shall capture or take, or attempt to capture or take, with any trap, snare, or net, any game bird. The permittee and designated helpers shall observe all Iowa fur trapping and fur possession regulations as provided by Iowa law, the Iowa Administrative Code, and the NWCO guidebook.
Iowa Admin. Code r. 571-114.11