Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321.66. Duty to hold vehicles

The proprietor of a garage and the proprietor's employees upon discovering that the engine number of a motor vehicle has been altered or obliterated shall immediately notify some member of the department or peace officer of the county in which the garage is located, and hold said vehicle for a period of twenty-four hours or until investigation shall have been made by such peace officer.