Vocabulary
DNA
Toolmarks
Ballistics
Crime Scene
100
Any impression, cut, gouge, scratch, or abrasion made when contact occurs between a tool and an object.
What are... Tool marks?
100
DNA stands for?
What is.. Deoxyribonucleic Acid?
100
How are impression evidence collected?
What are...Castings?
100
Bullets always travel in this type of path.
What is...palaboric path?
100
If a bullet wound had an impact angle of 73 degrees, what would be the angle at which the gun was shot?
What is... 19 degrees?
Triangle angles add up to 180 degrees.
180-73-90= 19 degrees
200
Marks produced along the edges as the surface is cut.
What... are Cut marks?
200
DNA would be classified as these types of evidence.
What are...Biological, circumstantial, individual?
200
Tool marks would be classified as these types of evidence.
What are... Circumstantial, physical, class?
200
Projectile bullets with striations and marks on it would be classified as these types of evidence.
What is... Physical, circumstantial, and individual?
200
A bullet hole was found at the scene of a bank robbery. The hole measures 4mm in width and 10 mm in length. What is the angle of impact?
What is... 23.6 degrees???
Sin-1 (W/L)= impact angle
300
Impressions made by a tool when pressed against a softer surface.
What is ...Indentation marks?
300
4 steps to create a DNA profile.
What is... Extraction, Amplification, Electrophoresis, and Analyze (CODIS)
300
Type of tool mark that would leave scratches behind.
What are...Abrasion Marks?
300
To calculate a bullet's trajectory, you would need the following:
What are... bullet speed, gravity, and angle?
300
If you found this footprint at the scene of the crime, what steps would you take to collect the evidence, and how would you classify the evidence?
What is... Create a casting of the print and compare the shoe indentations and markings to any known suspect's shoes.
Classification: Physical, circumstantial, class.
400
Grooves in the barrel of the gun increase the accuracy of the bullet. What is this term called?
What is...Rifling?
400
The three-step process of completing PCR (polymerase chain reaction)
100 points for each step and 100 points for explanation.
What is.. 1. Denaturing (separating the DNA strands), 2. Anneling (binding a primer to the target section of DNA), 3. Extension (add in the complementary base pairs)
400
Cracks on glass that are created by the stress of the object striking it.
What are... radial cracks?
400
Ballistics can be individual evidence, what things found on a bullet cartridge would indicate it being individual evidence?
What are...Firing pin marks, extractor marks, rifling striations?
400
Based on the two gunshots through the glass, which one came first? Explain
.
What is... Gunshot B came first because its radial crack extends out, as gunshot A's radial cracks reach B's and stop.
500
One of the three categories of ballistics that focuses on "what happens from the time the projectile leaves the weapon and hits the target".
What is... External Ballistics?
500
Not on the test....
When looking at a STR report, what major clue would indicate what gender the DNA belongs to?
What is... Having the STRs located on a Y-chromosome?
500
These type of tool marks were found at the scene of the crime. What type of impressions would you say they left there, and what tool do you believe made it?
What is.... Abrasion (scratching)....Tool....
500
100 points each: Explain what ballistic evidence could be found at scene of the crime.
What is... type of firearm used, caliber of the bullet, number of bullets fired, where the shooter was, weapon fired recently, firearm used in a previous crime.
500
500 points for each of the database systems used for any of the forms of evidence we have discussed.
Ballistics: NIBIN
Fingerprints: IAFIS
DNA: CODIS