Biological Evidence Paper

Shirley Newton

CJS/215-Introduction to Forensics

June 18, 2016

Professor: James Anderson

Biological Evidence Paper

Various biological samples can be identified as significant. To make a

significant in or of a substance a fluid has to present within itself. A person DNA can do

a lot of things in the specific biological world: such as link someone to a crime scene

and identify a person(s). DNA can be taking from various different sources including

blood, skin cells, semen, hair, saliva, and tissue. The use of organic materials, such as

blood, semen, hair, salvia, and skin tissue, in forensic science biological evidence.

Forensic scientists use different methods to identify their victims and criminals such as

Fingernail scrapings and bones. A very important part of solving sexual assault and

Violent crime cases are the use of biological evidence. A forensic scientist is able to

locate some of the smallest pieces of biological evidence from a crime scene that you

wouldn’t hardly be able to see it with the naked eye. The principles basis is that every

time a person enters a room or environment, they take something with them and leave

something behind which would be known as biological evidence.

In order to avoid cross contamination there are special needs and techniques

that are required to make sure the preserving process is done right. Whether the

process is done with a saliva sample or a semen sample all just as important. Then the

finish product is cross examined with people to find out if they are guilty or innocent of

the crime they are being charge with. Very important facts and processes will be

discussed in this paper such as difference types of evidence and to preserve the

evidence. When it is obtained and to preserve the evidence when it is obtained from the

crime scene. When the forensics team shows up to the crime scene there are many

different types of evidence they can will encounter. The transportation of the evidence is

very important to the team because they have to make sure they don’t cross

contaminate or get any other substances in them so the outcome isn’t something totally

different than certain personnel assigned to it. The different types of evidence have

different set of rules on how they should be transported and coursed for when they are

looked through or examined. For example, one person or will be in charge of ballistics,

while another know member will handle blood stain. Different types of crime scene

could differ divisibly in evidence. A good example would be a sexual assault case,

therefore, you would be looking for bodily fluids or hair samples within the area the

crime took place at. One of the most effective pieces of evidence would be blood. Blood

can help do a lot of things that can help solve the case like the most important one.

Identifying a person. DNA is the one thing nobody can deny. Blood can also help tell the

Story of what took place when the crime was being committed by piecing together the

Spatter content in the room(s) like a great a great big puzzle. That’s why obtaining the

Blood evidence is a major “piece of the pie” and has be made so made so that the

handing is very delicate and cross contaminating is not an option at all. If either of the

two were to be treated any less than that would be a chance to take that could cost

everyone the whole case and solving the mystery all together. The samples of the

blood that the forensics teams has to obtain can be wet or dry, and whole the blood is

located depends on how it can or cannot be extracted. Of course the set of rules for

both are different but not so much as different as it would be to some other land of

evidence.

Each set of rules that go with the two types of blood have their advantages and their disadvantages in the approach of retries the best qualities of samples for the

evidence. To retrieve a good sample of biological evidence pertaining to dried blood

there are different methods required to get a “good” sample of it. The most commonly

used method for this is called “tape lifting” blood stains by taking fingerprints tape and

putting it over the blood stain, then take a blunt object and run it over the tape. Catching

the culprit and solving the case can be controlled by the biological evidence and how it

is treated when being obtained and transported. Biological identification can also be

very important in identifying the suspect or victim of the crime being committed. If

evidence can’t be found anywhere else or if enough evidence can’t be gathered, the

body always has a great source of the evidence.

So don’t forget to check the body! When the team is checking out the crime

scene and all the pieces of evidences, no matter how small the significance is should be

“bagged and tagged” as they say. Pictures are also a very good piece of evidence that

can be very important in helping the team remember where all the actual evidence was

placed in all the actual evidence was placed in the crime scene. That way the team

could set up their own their own crime scene and practice and getting a better

understanding of what happened when everything took place.

Hair and blood are two of the most common pieces of evidences found at the

crime scene. Loose hair and blood spatter are to be collected for testing because at first

it is super hard to tell who or what they belong to. The loose strained of hair that’s being

collected can tell who was there either before the crime happened or after the crime, or

of course when it was happening. The blood spatter can also help with who was there

when the crime was being committed but it can also help also figure out how exactly the

crime was committed and by what it was committed with. The past few decades the

courts have been placing huge emphasis on physical evidence here lately. The

important of the successful resolution of barely less than all criminal investigators. The

initial stages of evidence examination are increasingly getting more and more

demanding. The increasing amount of rigorous court challenges is the reason for the

emphasis on the evidence collection and preservation. Also the introduction of DNA in

a court is affected by methods used to recognize document, collect, and preserve

biological evidence. So without biological evidence the investigative world would not be

be to identify victims or criminals with DNA, blood spatter, finger prints, saliva hair, skin

cells, semen, and tissue. Biological evidences have come a very long way and in my

opinion will still go a very long way. We are just getting started.