This identifiable bullet which is unduplicatable by a third party places plural (two or more) sets of identification codes onto or into a bullet and to make the identification codes in concordance. Thus, the bullet remains identifiable. At least one set of the identification code or codes can be encrypted. In this way, the mutual relations among the identification codes become confidential to a third party, so that the bullet becomes unduplicatable. In one embodiment, each identification code is placed on a different kind of material, and this enables an investigator to detect and compare the identification codes more easily after shooting of the bullet.