It might be time to reconsider that license plate frame boasting your allegiance to your favorite baseball team, charitable cause or alma mater, especially if you’re driving in The Hawkeye State. The Iowa Supreme Court just ruled that drivers whose cars display the frames can be stopped if they obscure the small print below the plate numbers. The decision ended a five-year court battle stemming from the 2009 traffic stop of a man suspected of dealing drugs based on information from a confidential informant. The court ruled 5-2 last week that a 1984 law requiring drivers to “permit full view...