At the Center of the Latest Mangione Hearings: A Battle Over a Backpack

For three weeks, defense lawyers argued that searches of Luigi Mangione’s bag were unconstitutional. But state prosecutors have other evidence — and a federal prosecution looms.Police officers in Altoona, Pa., took ammunition, a homemade silencer, a notebook, handwritten notes and a 3-D printed gun from Luigi Mangione’s backpack.