Traffic Stops
Iowa Code § 321.174 — the license in immediate possession, shown on a peace officer's demand
- A person may not drive on an Iowa highway without a driver's license valid for the vehicle.
- A licensee keeps the license in immediate possession at all times while driving, and displays it on the demand of a peace officer, a judge or magistrate, or a department examiner.
Insurance on a phone. The driver keeps proof of financial liability coverage in the vehicle, and the card may be paper or electronic, including an image on a cellular telephone or other portable electronic device.
The Fourth Amendment sets limits on every stop, and the Supreme Court of the United States has drawn several of them. It has held that a stop is reasonable where the officer has probable cause to believe a traffic violation occurred, whatever the officer's actual motive; that an officer making a lawful stop may order the driver, and the passengers, out of the vehicle; that a passenger is seized by the stop and may challenge it; and that a stop may last no longer than its purpose requires, so it may not be extended for a dog sniff without separate reasonable suspicion. It has also held that consent to a search has to be voluntary, judged on all the circumstances, and that the prosecution does not have to prove the person knew they could refuse. Those holdings are a floor: a state's own constitution and statutes can give more protection than they do, never less.
Sources for this section (8)
- Iowa Code § 321.174 — Operators licensed — operation of commercial motor vehicles
- Iowa Code § 321.20B — Financial liability coverage — proof required — violations — penalties — exceptions
- Whren v. United States, 517 U.S. 806 (1996) — A traffic stop is reasonable when there is probable cause of a traffic violation
- Pennsylvania v. Mimms, 434 U.S. 106 (1977) — An officer may order the driver out of a lawfully stopped car
- Maryland v. Wilson, 519 U.S. 408 (1997) — An officer may order passengers out of a lawfully stopped car
- Brendlin v. California, 551 U.S. 249 (2007) — A passenger is seized by a traffic stop and may challenge it
- Rodriguez v. United States, 575 U.S. 348 (2015) — A stop may not be extended beyond its purpose to run a dog sniff
- Schneckloth v. Bustamonte, 412 U.S. 218 (1973) — Consent to a search must be voluntary
Legal information, not legal advice. Verified as of October 2026. Applying it to a particular situation is the work of a licensed Iowa attorney.