Identification Techniques Used for Firearms, Tool Marks, and Other Impressions

A chemical used in the film that is apart of forensic science is a gel like substance that is placed under the

We found a 40 caliber at the house that matched the casings from the scene, we diagramed the location and the condition as well as photographed before recovering and securing. I examined to see if the weapon was loaded and it was not. I marked the position of the cylinder, using two pen marks I put on the top of the cylinder alone each side of the top strap of the frame. I noted the loaded casings found in the box of ammunition in the field notes. It was then bagged and sent to the lab.

crime scene could be analyzed and compared with a sample from a suspect. A match could place

However, according to a documented FBI ballistics test carried out on October 12, 1975, the AR-15 rifle found in Robideau's car didn't match bullet found on the scene; even if it is assumed to be Peltier's gun, the gun cannot be linked to any bullets found in the crime scene (Incident). The FBI also did another, less effective form of test on the bullet that showed that the bullet might have come from the damaged gun. (Incident) However, since the second method of testing was more prone to fault, error, and interpretation of the agents, it should not be used in light of the first. The best the FBI could prove from the test was that the bullet came from

Why do you think it is so important that all evidence be identified (such as marking the bullets and tagging firearms)? What consequences might result if these procedures were not followed?

An investigation involving a firearm is a specialty of forensic science which focuses on the examination of firearms linked to ballistics. Ballistics is related to finding out the exact flight path of projectiles. Ballistics is the area of study that examines the exact path of the bullet from the moment it leaves the muzzle of the firearm up until it hits the target. During examination many items are collected for evidence including the firearm, bullets, live ammunition, cartridge casings, trace materials such as powder residue, and anything damaged by the projectile. Firearms are often divided into three processes: Internal, External, and Terminal Ballistics. Internal refers to the inside of the firearm; the space of time in which the shooter pulls the trigger, and the when the bullet is exiting. External ballistics is the flight between leaving the muzzle of the firearm, and it striking its target. Terminal ballistics is the impact of ballistics that refers to the examination in which the projectile strikes a target. All firearms leave markings on the cartridge casings once expelled when firing. Ballistic identification and microstamping laws make it possible to link a cartridge recovered to the

In the event that any firearm is discovered at a crime scene there are certain steps that need to be done in order to properly collect any type of firearm evidence. If there is any kind of firearm found at the scene it should be rendered safe immediately. For safety is the first priority at any crime scene. Forensic technicians should assign an evidence number to the firearm, photograph orientation and close-up view’s, and take measurements of the firearm’s location prior to collecting it. In order to deem a semiautomatic pistol safe, the forensic technician should be wearing latex gloves an unload the weapon as follows; (Tina Young, 2011)

In the United States, crimes are constantly being committed. Some of the crimes that are committed are simple, and other crimes are extremely complex. Every complex crime comes with its own challenges in distinguishing material evidence. Some evidence can be tiny as a hair, or a fiber that can be located on a piece of clothing or carpet. Even though, the size of the evidence is not important, the information that it provides investigators is crucial to finding the suspect of the crime. With the assistance of trace evidence, investigators can obtain the small particles that can transfer from two objects come together. Collecting material from any crime scene can yield a plethora of information. However, by properly collecting material evidence like the tire print impression, pubic hairs, multiple dog hairs, and foreign fibers. Investigators, were able to convict Cecil Sutherland for kidnapping, sexual assault, and three counts of murder.

An odontologist examined the teeth to try and identify the body but attempts were unsuccessful. While results of the gun were sent to a ballistics expert, perhaps they should have been present at the

The forensic examinations I would perform are bullet stria examination, external ballistics, blackening, GSR testing, and ferrozine testing. Based on the stria of the rounds that can be recovered from the walls of the crime scene they can be matched to test rounds fired from the weapon to confirm they match. Stria can also be called striation marks. Stria or Striation marks are spiral lines left on the bullet and bullet casing. Stria on the bullet is formed by the barrel rifling when the weapon is fired.

Goddard composed an article in 1925 titled “Forensic Ballistics”. This article explained the analysis of firearm evidence by using a comparison microscope. The comparison microscope

Ballistics Expert: Provide important analysis at crime scenes as to which gun was used, where

When a firearm is discharged multiple forms of trace evidence are created. Comparative ballistic techniques can link the projectile to the weapon. Microstamping can link a spent bullet casing to the weapon that discharged it. Traces of gunshot residue (GSR) can be used to link a suspect to a discharged weapon. Utilizing similar methods of microscopy that are applied to analyzing other items of trace evidence such as hairs, fibers, and illegal substances, the scanning electron microscope is currently being utilized to detect and identify gunshot residue.

A segment of the Forensic Science in the Criminal equity organization that the vast majority acquainted with these days, however, few individuals know how this particular science came to be. Overall, legal science is intended to utilize experimental standards to clarify obscure parts of a wrongdoing. Through the utilization of uncommon tests and lab gear that permits researchers to recognize decisively different parts of a bit of confirmation in an illegal behavior. On the off chance that you occupied with finding out about how this procedure came to fruition, you have to peruse the recorded data underneath. Here is a brief history

Today, more than ever, the quality of evidence in criminal cases is scrutinized because of contamination. Contamination is the introduction of something that physically corrupts a substance at a crime scene that was not previously there; it comes in many forms and most often times comes from the humans who investigate a crime scene. It is imperative that prevention of cross-contamination is implemented when gathering evidence. Several of the more sensitive forensic techniques such as trace analysis, bloodspatter interpretation, and DNA comparison are not being used to their fullest potential. Items of physical crime scene evidence are not always visible to the naked eye and may be easily overlooked so deliberate and methodical approach to collection and preservation of evidence is essential. Prosecutors have lost cases due to crime scene contamination; this could be prevented by simple and productive behaviors. The U.S. Supreme Court, in a leading case on physical evidence, stated: