Last summer we outlined a number of changes to the Criminal Investigations textbook on the promotional reading list. I recommend you go back and check those out, and we will be picking up where we left off in the textbook. Although we wont be hittng every change in the textbook (we leave that to our outlines for the most part) we will be touching on alot of them in the coming months for all four textbooks.
In keeping with that, in Criminal investigations Chapter 9, Injury and Death Investigations the area surrounding firearms wounds has changed. We also recommend that you look at the textbook and read the portion on Rifle wounds which is new to the edition as well.
An Exerpt from our outline:
Close and distant shots – changed
a contact bullet wound is one in which the muzzle of a firearm is pressed against the body when the shot was fired. In a close shot, the distance of the muzzle is less than 18 inches from the body, whereas a distant shot is one fired at a greater distance than 18 inches.
In the case of a contact shot against an exposed part of the body, soot, metallic particles, and powder residues are driven into the body and can be found there during the autopsy.
In a contact discharge, the entrance wound differs considerably from an entrance wound in a close shot or distant shot. When a contact shot is fired, the gases of the explosion are driven into the track but are forced out again and produce a bursting effect on the skin and clothes. The entrance wound is often star shaped with flaps directed outward.
A close shot produces a zone of blackening around the entrance wound on the skin or on the clothes. Sometimes the flame from the muzzle has a singeing action around the opening, with hair and textile fibers curled up.
Close shots with black powder show marks of burning up to a distance of 4 to 6 inches and a distinct deposit of powder smoke up to 10 to 12 inches. Dispursed grains of powder are embedded in the target may be detected even at a distance of 3 feet. In distant shots none of the characteristics of a close shot can be detected.
High velocity rifle wounds – new addition to textbook