A case of murder with gunshot is repoed. A metal bullet is recovered from the body. Primary and Secondary markings on a metal bullet can be used for

A i.e. Identification of weapon - Primary markings (class characteristics) and secondary markings (metallic fouling, individual or accidental characteristics) on a bullet can be used for identification of weaponQ. - Bullet is picked up with handsQ. Gunshot residue on hands can be detected by Dermal nitrate testQ.