Think of a movie/TV program that show criminal investigations involving firearms.
1) Which firearm evidence might be considered individual evidence versus class evidence?
2) What information about the firearm or shooter could be gained from the ballistic evidence?
The Structure of DNA
Deoxyribonucleic acid, or DNA, is found in all living organisms. The structure of DNA allows it to be quickly and easily copied so that it can be passed down through generations. An incomplete model of DNA is shown in the image.
1
Question 4
4.
Question 5
5.
1
1
Question 7
7.
Where are headstamp markings typically found on a cartridge case?
1
Question 8
8.
What are firing pin impressions and how are they related to firearm identification?
1
Question 9
9.
What is a breechblock impression and how is it created?
1
1
Question 11
11.
How is the distance between the shooter and the victim approximated using the spray pattern from shot pellets?
1
Air that is closer to Earth's surface is warmed because it is heated by Earth's surface. Which diagram correctly models the motion and spacing of gas particles as they are heated and cooled near the Earth's surface?
Warmer air molecules are spaced farther apart, move at a faster speed, and are near Earth's surface; cooler air molecules are closer together, move at a slower speed, and are farther from Earth's surface.
The air molecules closer to Earth's surface are warmer, so they are faster and farther apart, not slower and closer together.
The air molecules closer to Earth's surface are warmer, so they are faster and farther apart, not slower and closer together, and the air molecules farther from Earth's surface are cooler, so they are slower and closer together, not faster and farther apart.
The air molecules farther from Earth's surface are cooler, so they are slower and closer together, not faster and farther apart.
Question 3
3.
Below is an image of a Colt automatic pistol. Categorize the following attributes as individual or class evidence regarding this firearm.
the firearm's manufacturer (Colt)
inside diameter of ammunition (measured in inches or mm)
type of firearm (pistol)
rifling marks
Class evidence
Individual evidence
The original firearms utilized wicks to ignite the gunpowder. These are known as __________ firearms.
flintlock
matchlock
percussion-cap
semi-automatic
Question 6
6.
Question 10
10.
Explain the significance of breechblock impressions in firearm identification. Why are they considered individual evidence?
Question 12
12.
Which table BEST completes the missing labels for the DNA model?
What information can be gathered from a spent cartridge casing?
rifling marks
firing pin/breechblock impressions impressions
caliber
ammunition manufacturer
extractor/ejector marks
Shotgun pellets or slugs can be utilized as individual evidence to determine exactly which firearm was used.
