Iowa is a state that requires magazines to be unloaded.
483A.36 Manner of conveyance.
No person, except as permitted by law, shall have or carry a gun in or on a vehicle on a public highway, unless the gun is taken down or totally contained in a securely fastened case, and its barrels and magazines are unloaded.
[C24, 27, 31, §1772; C35, §1794-e21; C39, §1794.104; C46, 50, 54, 58, 62, 66, §110.23; C71, 73, 75, 77, §110.24; C79, 81, §110.36]
86 Acts, ch 1240, §10
For applicable scheduled fine, see §805.8B, subsection 3, paragraph q
Section not amended; footnote revised