Introduction to Forensic Science

Topics: Firearm, Rifling, Forensic science Pages: 2 (614 words) Published: January 16, 2014
Module Five: Text Questions
Review Questions
1. What is the NIBIN? NIBIN is the National Integrated Ballistic Identification Network that was created by the FBI and the ATF in 1999. 2. What is rifling? What two types of markings does this produce? Rifling is when each gun is given spiral grooves by the manufacturer. The spiral grooves are cut into the barrel of a gun in order to make a bullet spin as it is fired. Rifling produces grooves and lands. 3. What is a distance determination? How is this done? A distance determination is the process of estimating the distance between where a shot is fired and its target. This is often done by looking at the patterns of powder residue and the shot pattern.  4. What is the Greiss Test? The Greiss Test uses chemicals to develop gunpowder residue patterns, particularly around bullet holes. 5. When a bullet is retrieved, how is it marked for identification purposes? What should be avoided?  Once a bullet has been retrieved, it is usually marked with the investigator's initials, often at the tip or base of the bullet. The sides of the bullet should not be marked. Care has to be taken that this mark does not cover or obscure any striations or markings on the bullet. Critical Thinking Questions

1. If you found a firearm at a crime scene, what steps would you take in order to transport the weapon to the lab? First, I would make a note about the position of the gun’s safety and hammer. Then, I would need to unload the gun before it is transported or handled in analysis. Finally, I would take each round from the firearm and place it in a separate envelope. 2. Why do you think it might be useful to know the distance between a gun fired and its target? It would be useful to know the distance because if you know the distance, you might be able to find more clues as to who committed the crime based on where they shot the victim. 3. If you were in charge of retrieving bullets at a crime scene, what steps would you take to retrieve a...
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