This Week in the Circuits: Gun Owners Take On Decades-Old Precedent

Welcome to This Week in the Circuits, a look at the most significant cases before federal appeals courts.

A group of concealed carry permit holders will urge the DC Circuit on Friday to revive their Second Amendment challenge to regulations for carrying firearms on subway trains in the nation’s capital.

The case could undo long-standing DC Circuit precedent requiring individuals pursuing a pre-enforcement constitutional challenge to show a credible, imminent threat of being prosecuted.

Washington in 2015 prohibited concealed handguns in its Metrorail transit system. The gun owners challenging the law say they have a constitutional right to carry concealed ...