Now in its third edition, this volume has been updated to reflect new research and technology. It examines firearms laws around the world; the mechanisms of various firearms and the linking of a particular bullet or cartridge with a suspected weapon; the development of new science in firearms; internal, external, and terminal (wound) ballistics; and the nature, composition, and detection of discharge residue left on a suspect. The book also explores the role of the ballistics expert at all stages of a case and describes new computer search techniques applied to digitally stored images of marks left on fired bullets and spent cartridge cases.