The Iowa tint law saids for car, truck, SUV, or Mini Van, front doors 70% VLT, rest anything. A sun visor strip up to the AS-1 line any VLT is allow on the front windshield.
VLT = Visible Light Transmission
The above information is not a legal document. It is the result of independent research, using several sources of public state documents. Window tinting laws vary from state to state and province to province. Before applying any window tinting materials, installers should thoroughly review the appropriate state regulations as well as local enforcement policies to insure compliance with all applicable standards.