At that point, the officer must simply allow the person to go on their way. However, it must be noted that this decision by the Iowa Supreme Court was determined on the basis of article I, section 8 of the Iowa Constitution, which provides more protection than the Fourth Amendment to the United States Constitution. "[C]abining official discretion to conduct searches is designed to prevent arbitrary use of police power. Limiting both the scope and duration of warrantless stops on the highway provides important means of fulfilling the constitutional purpose behind article I section 8, namely, ensuring that government power is exercised in a carefully limited manner." State of Iowa v. Coleman (2017).