Abstract: A system and method for identifying a purchaser of ammunition from empty cartridge casings, sometimes found at a crime scene, by tagging the ammunition with purchaser identifying indicia at a point-of-sale. When an ammunition purchaser requests a purchase of ammunition and provides identification and identifying indicia at a point of sale location, a point-of-sale ammunition supplier verifies the validity of the provided purchaser information. If the purchaser information cannot be verified, the ammunition purchase may be refused. If the purchaser information can be verified, the point-of-sale supplier inscribes the purchaser identifying indicia on the ammunition cartridge casing and sells the purchaser the ammunition. The purchaser of the ammunition may be subsequently identified by the identifying indicia on the cartridge casing.