Chattanooga officers suspect marijuana smoke in a car stopped for suspicious tags; Atlanta officers assist an undercover unit; Des Moines cops answer a domestic-dispute call.

In Chattanooga, Officer Christopher Smith and his partner Officer David Holloway observe as the driver of a stolen vehicle crashes into the side of a house. In Fort Worth, Texas, Officer Eddleman happens upon a fire at a local motel, a blaze later determined to be the work of an arsonist. In Des Moines, Iowa, Officer Cornwell gives chase when a speeding motorcyclist ditches his vehicle and flees on foot.