Determination of the distance from muzzle to victim from the appearance of a gunshot wound in the skin is often of great importance. Such information may be necessary to confirm or disprove an account of the circumstances surrounding a death due to firearms. Contact wounds generally can be recognized by the presence of soot and powder in and around the wound as well as searing of the skin from the flame. When the contact wound overlays bone, tearing of the skin or muzzle imprints may be present. Intermediate range gunshot wounds are characterized by powder tattooing (stippling) of the skin around the wound of entrance. Soot may or may not be present. While soot can usually be wiped away, powder tattooing cannot. When the muzzle-to-target distance increases so that powder tattooing no longer occurs, the gunshot wound is called a distant wound and range determinations can no longer be made.

The examination of gunshot residues in a forensic science laboratory should be a series of integrated procedures. The Southwestern Institute of Forensic Sciences includes both the Office of the Medical Examiner and the Criminal Investigation Laboratory. Accordingly, a unique opportunity for comprehensive and coordinated examination of gunshot residues presents itself. This paper deals with those aspects involving items of clothing and deposits which may be present on the hand; the pathological evidence is not covered.

In most instances of death from gunshot wounds, the forensic pathologist is readily able to determine whether or not a particular gunshot wound was inflicted at contact, intermediate, or distant range. In some instances, however, such a determination is virtually impossible. Most difficulty occurs in differentiating a contact wound from a distant wound. A contact wound is apparent when soot is present on the outside of the skin, if there is a muzzle imprint, or if there is tearing of the skin caused by the effects of gas. However, determination of whether a wound is contact or distant can be a problem when (1) the body is decomposed; (2) the deceased has survived days or weeks after the initial wound; (3) the wound is a contact wound and there are multiple layers of clothing that filter out the soot and powder; and (4) the edges of the wound have dried in contact wounds with small caliber weapons.