History/Law/Crime Scenes
Blood evidence at a crime scene should be:
allowed to dry and then packaged in a paper bag evidence bag to prevent mold and/or mildew
Determination of ancestry from skeletal remains is difficult. Ancestry is best determined by
nasal cavity features on the skull
What are Wallner lines?
Stress marks on the edges of broken glass
Which fingerprint pattern is the most common among the population?
loop
What does CODIS stand for in forensic science?
Combined DNA Index System
The most important consideration for photographing a crime scene is
for the crime scene to be in an unaltered condition
The stage of fusion of various bones within a skeleton can be examined to learn what about the deceased?
age
Which two properties are commonly used to classify glass fragments?
Refractive index and density
What is a 'delta' in fingerprint patterns?
triangle shaped pattern on fingerprint
What is the process of comparing DNA samples to determine identity or parentage called?
DNA Fingerprinting
The main reason for sealing off a crime scene is
To keep evidence from being contaminated or destroyed
What does the term rigor mortis refer to?
Stiffness of death
If a fiber has the odor of burning hair and forms a round shiny black bead when burned, it is likely to be:
silk
What is the current theory regarding fingerprints?
No two people have the same fingerprint
What is one of the more common methods for collecting a suspect's DNA sample?
Buccal Swab
What is the Frye Standard?
a judge determines the admissibility and validity of the evidence
According to forensic entomologists, which “witness” is the first to arrive at the crime scene?
blowfly
What type of fibers tend to have a rough external surface and often look like hair?
natural fibers
How does the rifling inside a gun barrel affect a bullet?
It causes the bullet to spin
Which test is used to determine if a blood sample is human or animal?
precipitin test
What distinguishes direct evidence from circumstantial evidence?
Direct evidence requires no inference to connect it to the crime, while circumstantial evidence requires the jury to make an inference.
Lividity can be expected to be fixed (permanent) after how long?
8 hours
What is the first step in fiber analysis?
Identifying the fiber and its characteristics
What does GSR stand for in ballistics?
Gunshot Residue
Which blood type has antibodies for both A and B proteins?
O