A professional who examines and tests firearms, spent bullets, and related evidence in criminal cases to develop facts useful in apprehension and prosecution of suspects. Responsibilities include:

• Examines bullets, bullet fragments, cartridge clips, firearms, and related evidence found at scene of crime or in possession of suspect to identify make and caliber of weapon.
• Test-fires weapons allegedly used to facilitate microscopic comparison of bullets from test weapon with those discovered at scene of crime.
• Determines, from knowledge of ballistics theory and standard test procedures, probable angle and distance from which crime weapon was fired, revealing origin of shot.
• Prepares reports of findings and testifies at inquests, trials, and other hearings to facilitate prosecution or exoneration of suspects on basis of determinations.
• May perform standardized tests on other articles of evidence, using chemical agents, physical-testing equipment, measuring instruments, and prescribed procedure, to determine relationship of evidence to suspect and to crime.
• May order and maintain departmental weapons and related equipment.
• May be designated by rank as Lieutenant, Ballistics.