What is an indispensable and single most important tool of the firearm examiner?

-The comparison microscope is an indispensable tool of the firearm examiner.

What is the single most important tool for a firearm examiner to examine and compare striations?

The single most important tool at the disposal of the firearms examiner is the comparison microscope.

Which of the following is the most important tool available to a ballistics expert?

The most important tool available to the firearm examiner in the identification of firearms is: digitizing videocamera.

Who utilized the comparison microscope for firearms examination and helped secure it as an indispensable firearms forensic tool?

One of the first prototypes of a comparison microscope was developed in 1913 in Germany. In 1929, using a comparison microscope adapted for forensic ballistics, Calvin Goddard and his partner Phillip Gravelle were able to absolve the Chicago Police Department of participation in the St. Valentine’s Day Massacre.

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What technique is used to detect GSR?

Gunshot residue (GSR) analysis is a standard method to determine if a firearm has been used. Particles for GSR analysis typically range from 0.5 to 10 microns. Often the primer particles containing lead (Pb), barium (Ba) and antimony (Sb) are detected and analyzed using EDS in a scanning electron microscope.

What is the most valuable tool to a firearms examiner?

The comparison microscope serves as the single most important tool to a firearms examiner. Two bullets can be observed and compared simultaneously within the same field of view.

Can bullets be traced to buyer?

Ammunition serialization is a law enforcement tool that could assist in solving gun-related crimes. … Later, when a bullet or cartridge case is found at a crime scene, the bullet or spent cartridge could be quickly traced back to the purchaser.

What are 2 examples of ballistic evidence?

Ballistic related evidence includes firearms or guns, bullets, and cartridges cases. Although a listing of ballistic related evidence is numerous – the most types of crime scene evidence include bullet holes and bullet damage on various mediums; bullet trajectories, and gunshot wounds.

What is the salary of a ballistics expert?

Ballistics experts are specialists in the field of forensic science. According to the U.S. Bureau of Labor Statistics’ (BLS) 2019 Occupational Employment Statistics, the average national annual salary for ballistics experts, who are classified under forensic science technicians, is $63,170.

What two things did they use to recreate the bullet trajectories?

Using at least two reference points, an investigator can recreate a bullet’s trajectory and determine where a shooter was located during a crime. Using at least two reference points, an investigator can recreate a bullet’s trajectory and determine where a shooter was located during a crime.

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What rifling method is no longer in use?

The hook cutter rifling method is still used today.

How long does gunpowder residue remain on a shooter’s hands?

Gunshot residue is the consistency of flour and typically only stays on the hands of a living person for 4–6 hours. Wiping the hands on anything, even putting them in and out of pockets can transfer gunshot residue off the hands.

What type of evidence is impression evidence?

Impression evidence is simply where several objects are pressed or stamped against one another allowing the objects to transfer and retain characteristics from one another. Footwear, tire tracks, and tool marks may be some of the most overlooked types of physical evidence left at a crime scene.

What gets rid of gun residue?

The limitations of all GSR techniques are that the residues can be removed by rubbing or washing the hands and usually must be collected soon after the firearm is fired, yet even valid GSR tests are not conclusive.

How accurate is a GSR test?

GSR tests results are considered reliable, and should be admitted into evidence. Gunshot residue can be removed by actions such as washing hands, wiping clothing, or brushing it off, so the absence of residue does not prove that the person did not recently fire a gun.

What two tests are performed to detect GSR on clothing?

The Modified Griess Test is the primary test used by firearms examiners to determine a muzzle-to-garment distance. The Modified Griess Test is performed by first treating a piece of desensitized photographic paper with a chemical mixture of sulfanilic acid in distilled water and alpha-naphthol in methanol.

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