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Forensic Science Questionnaire

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Krystal Pelfrey

on 30 August 2015

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Transcript of Forensic Science Questionnaire

Forensic Science Questionnaire
Review Question #1:
In Criminal Investigation, there are four different types of evidence that can be part of the process and investigation. Those are the following:

Physical Evidence:

This includes tangible objects such as weapons, trace evidence like hair, blood, fibers, and blood.
Documentary Evidence:
This is evidence that is written or recorded in any way, such as a telephone conversation or video recording.
Review Question #5:
Soil is a very important piece of evidence in Forensic Scientists, and perhaps one of the most difficult to analyze and preserve. Forensic Scientists typically collect soil evidence delicately, but collecting specimens from the very top surface of the ground, rather than deep down. If an object, such as a piece of clothing or shoe, has dirt or dried mud upon it, the soil will be left untouched, and the entire object itself will be taken to be analyzed and carefully examined. The object will be placed in a plastic bag or container to ensure no soil evidence is lost within transportation.
Critical Thinking Questions #3:
Although there are many limitations in class characteristics, they can be very assistive in providing additional evidence that can further be analyzed and observed. Typically, there may not be a lot of physical evidence or individual characeristics to work off of - and when there is a lack of them - Class characterics can come in to further assist officials in weeding out the true suspect - and when paired with true individual characteristics, makes the evidence all the more strong and justice serving.
Critical Thinking Question #4:
I personally feel as though impressions are a very intricate piece of evidence, and I would be very nervous in collecting and preserving that said evidence due to it's delicacy. I would think that molds are very difficult to work with, although there have been many advancements in molds that are more sturdy and less breakable/fragile in using them. Many impressions are taken from many different types of surfaces, such as clear glass or smooth surfaces, they are taken with clear tape. A special tool called an electrostatic dust print lifter is used to take impressions in dust - as I said, molds are used to take
Critical Thinking Question #5:
If I were on a jury, I would personally respect and be grateful for any and every piece of evidence that scientists were able to provide. While Individual characteristics are a major advancement in providing a clear answer in a case, I understand that they are not always readily available. I think that if individuals constantly expected to have individual characteristics when they are not that easy to come by, many other types of evidence, such as Class Characteristic types, would be over looked and undermined and the true answers and considerations would not be taken
Critical Thinking Question #1:
The Scientific world is situated entirely around creating theories, supporting evidence, and conducting tests that are reporducible, secure, and accurate. These are very important aspects of the Scientfic Method, and without those aspects, Science in any type of field would not be reliable, trustworthy, or secure. It is very important to ensure tests are sensitive, specific and reproducible even more so in the Forensic Field, as many individuals rely on the justice
Critical Thinking Question #2:
While I believe every piece of evidence is neccessary, and proves a very important, and long standing relevance in the many investigations of Forensic Science, I do believe that Individual Characterists in evidence is very important. Physical evidence is equally very important, in my book, and when paired explicitly and accurately with Individual characteristics, they prove to be very problem solving and revealing of the true evidence and outcome of a crime or act of criminal misconduct.
Review Question #3:
As we talked about in the previous questio, Individual characteristics are specific characteristics that provide straight forward direct links to the evidence, a suspect, and the crime in which is committed. Class Characteristics, however, are types of evidence that can only be associated with a group, and not one single source - such as a the clothing fiber of denim blue jeans, or the fibers of a specific type of work attire near a work office. Class Characteristics must be analyzed more closely and further investigation must be completed to find the true suspect/offender.
Review Question #4:
When Forensic Scientists are analyzing evidence, they typically focus on two different aspects of said evidence. Physical properties are those types of properties that describe or identify an object or substance without the help or cross contamination of another substance - Such as it's weight, size, color, e.t.c. Chemical ties are those that describe the occurences when a substance reacts or catalyzes with another substance. For example, when officers field test a unidentified powder, it will react a certain way
Review Question #2:
Individual characeristics are a type of evidence with specific characteristics that can be traced directly to a specific item or personnel, that links them directly to the crime committed.

Example: A woman is murdered inside her apartment. Finger prints are pulled on the windowpane of her apartment, which match a murder weapon found two miles away. The blood on the murder weapon also matches to woman. If the fingerprints are matched to
What are the four types of evidence in a criminal investigation?
What are individual characteristics? Give an example of an individual characteristic?
What is the difference between individual characteristics and class characteristics?
What are physical and chemical properties? Give an example of each.
What do forensic scientists do to collect and preserve soil samples?
Why do you think forensic scientists are so careful that the tests they do are sensitive, reproducible, and specific? What might happen if they were less careful about this?
Which type of evidence do you think is most useful in an investigation? Why?
Why do you think that forensic scientists continue to look for class characteristics given their limitations?
What do you think would be some of the challenges in collecting and preserving impressions? Why?
If you were on a jury, do you think you would expect individual characteristics in the evidence? Why or why not? What effects might it have if individuals expect to have individuals characteristics presented?
Demonstrative Evidence:
This is evidence that is used to recreate a crime. Such as
a model or
testimony is
evidence that is
given by the
witness during
a suspect, that is an individual characteristic.
if it is a certain type of drug, like heroin.
and evidence that is provided. Many times,
peoples life, liberty, and justice are in the hands of the Forensic world, they must be true.
impressions in dirt. It's all very intricate and precise.
as often as they should be.
By Krystal Pelfrey - 8/28/15
Forensic Science module three.
Full transcript