Human Identity (Fingerprints, Forensic Anthropology, DNA)
Any object that can establish that a crime has been committed or can link a crime and its victim or perpetrator is called?
Physical Evidence
32.The _______ is the part of the hair that is most likely to contain DNA.
follicle tag
What tools do experts use to analyze and compare paint samples?
Microscopes, pyrolysis gas chromatography
Bloodstains that are created when the force acting on the blood is gravity are called
passive
Any mark made in a softer surface by a harder implement is called a
tool mark
Hair samples, blood samples, bullets, hand swabs, etc, are all evidence that would logically found or taken at what kinds of crime scenes?
Violent Crime
34.One difference between human and animal hair is the frequent absence of the ________ in humans.
medulla
What is an analyte in a chemical testing situation?
The material being analyzed
The air temperature of the surroundings of a body is called the _______ temperature.
ambient
Any mark made in a softer surface by a harder implement is called a
make the bullet spin, which allows it to maintain its path.
What factors help an investigator decide how to search a crime scene?
Size of scene, locale, type of crime, available search team, scope of scene
List (in order) the three stages of hair growth.
Anagen, catagen, telogen
What is the name for the little containers that we used in the colorimeter?
cuvettes
How do investigators find blood evidence that is not visible to the naked eye?
Luminol and Kastle Meyer
The rifling lands leave deep marks in a bullet as it travels through the barrel, and the grooves leave raised areas on the bullet. Within these impressions are microscopic scratches called _______. These are unique to the firearm, so they are considered to have ___________ characteristics.
striations & individualizing
The first rule in crime scene photography is:
do not touch/move/disturb evidence unless it is in imminent danger of being lost/destroyed
Soil (and other related material) is best examined by a forensic
geologist
How is gas chromatography used in tandem with mass spectrometry?
The parts that are separated via GC are sent directly to MS
The smaller the size of the droplets in a spray of blood spatter, the:
higher the velocity at which they were moving
How can an expert tell which way a blood drop was traveling before it hit a surface?
The tail points in the direction it was travelling.
The final evaluator of forensic evidence is the
Jury
If DNA is found from hair and is matched to a known DNA sample, then the hair is considered to have _______ characteristics.
individualizing
What is the mathematical relationship between the frequency, wavelength, and speed of light?
c=λf
How does the shape of a blood stain change as the angle of impact increases (from zero to 90 degrees)?
The closer to 90 degrees, the more circular the stain
What factors affect the ability of adult flies to find a corpse and lay eggs on it?
Flies usually won’t fly in the rain (especially storms); if a body is tightly wrapped it will take them longer to find it and get to it. If a body is buried it will delay the flies.