What is a ghost gun? Weapon found on Luigi Mangione

Police arrested Luigi Mangione in the Manhattan killing of UnitedHealthcare's CEO Brian Thompson. Mangione was found with a weapon, mask, writings and other evidence. He was carrying a ghost gun, a type of weapon that can be assembled at home from parts without a serial number, making them difficult to trace, investigators said. LiveNOW's Andrew Craft spoke to FOX 13 Tampa's Genevieve Curtis about ghost guns and the connection to Mangione.