Answer & Explanation:I’m currently in my Law Enforcement SKILLS portion in school and my instructor asked me to write a reflection paper on Bloodborne
Pathogens. This class is my CRIME SCENE course meaning how can Bloodborne
Pathogens affect law enforcement or police officer and MOST of all what did I learn from class on this topic. It’s a reflection paper that has to be 1,000 words or more below I’ve attached my notes I’ve taken from my crime scene class.PLEASE FEEL FREE TO ASK ANY QUESTIONS
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Wednesday, August 17, 2016
Bloodborne Pathogens (WILL LIVE OUTSIDE OF SCENE, WILL LIVE IN DRY BLOOD)
Hep B, Hep C, HIV
-How do we protect ourselves?
Means of Transmission:
-Cuts or punctures from objects (knives or broken glass)
-Contact with your mucous members your eyes, nose or mouth)
-Contact between cut or injured skin and contaminated blood or other infectious material.
What is potentially infectious?
-2% infection rate with HEP C and open wounds
-No reported infections through intact skin
Cleaning yourself and equipment
-Hand washing- Even if PPE is used!
-10% bleach for equipment
WHAT IS DNA
-Biological/Genetic Material in all living things
-Combination of you mother and fathers DNA
-Unique to YOU, unless you have a twin
WHERE IS DNA FOUND?
DNA is the same in every cell
-The most common sources for evidence are:
SEMEN, VAGINAL FLUID
SKIN CELLS, PERSPIRATION
BONE, TEETH, HAIR
SALIVA, MUCUS, FINGERNAILS
URINE, FECES, ETC..
(CAN’T PUT EVIDENCE IN PLASTIC SINCE EVIDENCE CAN BECOME MOLDED AND MOLD EATS DNA) so
brown paper bag it
Common Objects Containing DNA Evidence
Bottles (COLLECT EVIDENCE BY PUNCHING OUT THE BOTTOM OF can/bottle NOT FROM PURING IT OUT)
The Value of DNA evidence?
Identify potential suspects
Associate victims/suspects to scenes
Associate victimes/suspects to one another
Identify victims through relatives even if no body is located
Can link suspects to local, state or national crimes
If properly collected and stored can assist with cold cases
Environmental factors; heat, sunlight, bacteria and mold an destroy DNA.
DNA from close relatives is more similar than unrelated individuals.
DNA cannot determine WHEN a person was at a crime scene.
DNA testing is very sensitive
Dealing with small samples
Special care must be taken to avoid
-CO-mbined DNA Index System
THREE INDEXES OF CODIS
-Forensic Index (cases with DNA evidence obtained from crime scene evidence)
Convicted Offender Index (DNA profiles of individuals convicted sex offenders)
Third Index (MISSING PERSON)
120,000 offender profiles
9411 forensic samples
investigations aided- 3200
Minnesota statute 609.117 says samples are to be taken from:
Convicted felons (or convicted of lesser charges)
Adults and Juveniles are tested
MARYLAND V. KING (2013)
U.S Supreme court cases (
JUST A TOUCH- only about 5-20 cells from the outermost layer of our skin
Doesn’t require you to see anything.
COLLECTING DNA SAMPLES
Collect the entire item
Take a sample from the item
Swab (MOST COMMON)
Uses sterile cotton tipped swab
Scrub the inside of the cheek
No food or drink for 20 minutes
Simple and painless procedures for obtaining a DNA sample
-Using new, clean, or sterile equipment for collecting evidence
Equipment must be new or cleaned between scenes
Tens are handled and packaged separately
Evidence containers are use
GLOVES AND PPE
When do you change gloves? (if evidence is on gloves change right away if like blood is on glove)
change glove when moving to another location in the crime scene.
Work with one item at a time
Date/Time of Collection
Description of Item
“DEATH INVESTIGATION evidence are kept FOREVER in evidence room.”
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