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Forensic science class
Terms in this set (120)
What area specializes in the identification & examination of skeletal remains?
There are currently about 320 crime laboratories in the United States.
What criteria might be used to establish someone as an expert witness?
All of the above. (Education, Experience, and publications.)
Forensic entomologists study what to help solve crimes ?
Forensic science had been decreasing in popularity as a profession over the last 10 years.
Forensic anthropologists help identify the victims of disasters like fires, explosions, and plane crashes.
What condition in the body happens as the blood stops pumping through the body and settles in the parts of the body lowest to the ground?
As an expert witness, a forensic scientist is ethically responsible for doing what?
Telling the whole truth.
A Chinese book has the first written record of medical knowledge to solving crime in description of how to distinguish between strangulation and drowning
Forensic odontologists might be involved in which of the following circumstances
A victim has a bite on his arm
Who stated that there is an exchange of materials when two objects come into contact with each other?
Proper collection, recording, and testing are essential to forensic work.
Who showed the uniqueness of fingerprints and how they could be used for identification?
Leone lattes found a way of using a comparison microscope to improve this technique to better match bullets
Who is known as the father of toxicology
The photographs of the crime scene should all be close ups of the evidence to show its details
Not all evidence is easily identified as evidence.
Virtually any object could be physical evidence under the right circumstances
What type of sketch is done at the Scene of the crime before the evidence is collected.
Good scientific analysis can over come poorly collected evidence.
All crime scene evidence has to be delivered in person to the crime lab
Each piece of evidence that is collected should be placed in a separate container
The first duty of the first responder is to begin collecting evidence
The rough sketches will contain measurements to allow later drawings to be drawn to scale
Molds might be used for what type of evidence
Blood should not be stored in which way
In an airtight container
Which of the following might be a piece of evidence
All of the above.
What is recorded in any sketches done of the crime scene
The distances of all objects from two points
Firearms should be stored in which type of package?
Intermediate photographs should show the relation of evidence to other parts of the crime scene
What is the frequency of an event
Impressions are easy to find individual characteristics in
Fingerprints cannot be used to identify particular people
Which of the following is an example of physical evidence
All of the above
Which fractures tend to occur first when a pane of glass is struck
Physical properties are those that an object or trace evidence has with just its physical existence without altering it in any way with chemicals
For glass fragments to be individualized what must be true
They must fit together
A ridge characteristic describes a property found where
Which of the following might be an individual characteristic in an impression
A broken tread
Class characteristics are those associated with what
What properties are those that describe what happens when a substance reacts with another substance
If soil is found in the bottom of a shoe the soil is left on the shoe and the entire shoe is taken to the crime lab
What is the first step in recording an impression
Taking a photograph
Radial fractures in a piece of glass look most like which of the following
Spokes of a wheel
Many soils can be distinguished from other samples by their color and texture
What reagent may be sprayed at a crime scene to identify blood
The first system to classify blood types is known as which of the following
What type of DNA is easiest to collect
What gives fingerprints their unique characteristics
What type of fingerprints is invisible to the naked eye
To distinguish between human and animal hair forensic scientists may look at what part of the hair
Some vegetable material can turn the Kastle Meyer color test pink as blood does
If a finger print is discovered on a dark surface what color fingerprint powder might be used
At most crime scenes investigators will only be able to recover partial fingerprints
A pricipitin test is uses to distinguish between animal and human blood
How much does hair grow on average in one month
When blood drop lands in a surface at a 90 degree angle what shape is the drop in typically
In the study that the FBI did on examining the physical characteristics of hair, what percentage of the "matches" were not really matches at all
On average there are about 10 ridge characteristics in a fingerprint
All fingerprints are invisible to the naked eye
What tool is used in analyzing bullets
How long does gunpowder residue remain on a shooters hands?
A few hours
When a bullet is fired gunpowder only travels back toward the shooter
Bullets only have class characteristics not individual characteristics
When a tool mark is found what is done first
Taking a photograph of the mark
Which of the following is a generally good way to pick up a firearm to preserve the evidence.
By the trigger guard.
If a gun is found in water what should investigators do to transport it to the lab
Keep the gun in some of the same water
What is used to make a cast of a tool mark
Gunpowder residue is most likely to show UP where on a shooters hand
The thumb web
Any wet clothing from a victim should be air dried before it is packaged
The barrel of a gun is also known as what
What can be used to recover serial numbers
An etching reagent
Where can q bullet be marked with the investigators initials
On the base
The diameter of the gun barrel is known as the caliber
Tool suspected of being used st a crime scene should be tried out in a tool mark to see if it fits
Tpohonomy is the study of what happens to animals or humans between the time that they die and the the time their remains are found
Forensic pathologists and anthropologists are usually able to identify the exact moment in time that death occurs.
What refers to any instrument or weapon used in a death, such as a knife or fire arm
Mechanism of death
The manner of death for a forensic autopsy is often suicide or homicide, as opposed to disease or other natural causes
What are actions or behaviors that may (or may not have) taken place before someone dies
A light meal will digest in about how many hours
Within three hours after death what happens to the eyes
A thin cloudy film develops
Rigor mortis typically disappears after how many hours
The type of insects and the stage of the insects life can give some indication on how long the body has been dead
Algor mortis is the gradual cooling of the body after death until it reaches the temperature of the air around it
In liver mortis the discoloration on the body is often which color?
What is the creation of a waxy substance when there is hydrogenation of fat in the body
The distribution or scatter if bones at a crime scene gives no indication about the time of death
Autopsies are only performed for a homicide
Solid foods digests faster than liquids
DNA samples should be stored in an airtight container to prevent contamination
Siblings will have the same nuclear DNA but different mtdna
Who discovered DNA typing
The repeated segments on the DNA strand are called VNTRs
Where my DNA be found on an envelope
On the licked area
About how many cells are present in our bodies
Mitochondrial DNA is found where in relation to the cell
Inside the cell but outside the nucleus
What is a major potential problem with DNA evidence
Contamination from other sources
Chromosomes are located where in relation to a cell
Inside the nucleus of the cell
DNA takes on what shape
Which of the following is not a technique used to analyze DNA
Skin cells from the inside of the cheeks are known as what
DNA evidence is typically easy to find at a crime scene
Jeans are basically and fundamental part of hereditary
MtDNA is transferred along material linage
An explosion occurs when what expands
The outward rush of gases from the bomb site of origin can be as high as what
7000 miles per hour
Most bombings are done by groups for political purposes
TNT is an example of a high explosive
Most arson fires are produced through what
An example of the high explosive is what
Molotov cocktails may leave behind pieces of the glass bottle or the wick used to ignite the gasoline
When evidence from an explosion reaches the lab what is one of the first technologies used to analyze it
Any materials or evidence collected from an explosion site are put into airtight containers
Mom investigators will search the entire crime scene in an attempt to find any detonating mechanism or other evidence
What is made by placing gasoline in a glass jar in using an ignition source
What are easily ignited or detonated and is very sensitive to heat and friction
If there is too little air why wont natural gas explode
Not enough oxygen
An example of a lower explosive is what
Gasoline is an example of an accelerant
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