The arrest of the Des Moines superintendent raises questions about immigration and legal status in Iowa’s education system.

U.S. immigration officials on Friday arrested the superintendent of the public schools system in Des Moines, Iowa, acting on what authorities said was a prior deportation order.

“This suspect was arrested in possession of a loaded weapon in a vehicle provided by Des Moines Public Schools after fleeing federal law enforcement,” ICE’s Enforcement and Removal Operations St. Pau...