Crime Scene Investigation Portfolio
-
Upload
brooke-dale -
Category
Documents
-
view
267 -
download
1
Transcript of Crime Scene Investigation Portfolio
CRIME SCENE INVESTIGATION PORTFOLIO
BROOKE DALE
SPRING 2016
PROTECTING THE CRIME SCENE INTEGRITY
Considerations of a crime scene: Indoors, Outdoors, Ingress, Egress, transient items
Protective Equipment: Disposable gloves, Masks, Hair Nets, Shoe Boots
Photography, Videography, Notes and Sketches
Chain of Custody
Admitting to Mistakes
ENTOMOLOGY
• What is Entomology?
• Entomology in the forensic disciple is a broad study of how insects interrelate specifically with the decomposition and disintegration of a human body.
ENTOMOLOGY CONTINUED
This is a pig that was dismembered and put into a bin to start decomposing without being directly exposed to the elements.
This is a photo of a pig that was just laying on the ground; directly exposed to the elements; decomposition has started as you can see the first set of larva has taken place.
HAIR FOLLICLES
Below is where we looked at the different stages of hair growth; Anagen, Catagen, and Telogen.
We applied what we learned about hair samples and looked at them under a microscope. We didn’t look at just human hair, either.
FINGERPRINTING
Here we took our own fingerprints and put them on a fingerprinting sheet, we also put our fingerprints on a balloon and blew it up to see our prints.
This is a photo of a print I lifted off of a pair of sunglasses using back fingerprinting powder on a semi-dark surface.
FINGERPRTINGCONTINUED
This is myself, in action, dusting for prints.
SHOE IMPRESSIONS/CASTING
This is where we made our boot impression in some soil. And we mixed our casting agent with water to put on top of our impression.
After some time had passed and the casting dried, we dug out the impression, cleaned it up and came out with a really good sample. You will notice the emblems/ logos are visible from boot-to-casting.
BLOOD DROPLET TESTING/ANALYSIS
In this class we were doing testing for blood stains on a tile using Leucomalachite Green (LMG), Filter papers, and Hydrogen Peroxide reagents.
This is an in-action picture of testing the blood droplets. Here is where we used the Leucomalachite Green on our swabs to test for the presence of Blood.
BLOODSTAIN MEASUREMENTS
Here is an exercise where I learned how to measure bloodstains. Which is Width (W) divided by Length (L) equals the Ratio| then you take Sin-1 and that equals your Angle of Impact.
This was an exercise where we learned how to determine an Area of Convergence; did this by taking the tail of the blood droplets and tracing them down and finding where the majority connect.
COLLECTION KITS
We have gone in and observed what was in a blood/urine collection kit, and the proper procedures to handling the items and going over the chain of command.
This is what was inside of our kit; we had blood vials/syringes and a cup for the urine, safety seals and instructions.
SEXUAL ASSAULT
Items in a sexual assault kit:
• known blood/ saliva samples
• blood/urine collection
• vaginal/anal/& oral swabs & smear slides
• additional swabs for dried body fluids/ bitemarks/ licks/kisses
• materials for collecting fingernail samples
• pubic hair combing
• debris collection
• proper packaging for clothes
• documentation.
SEXUAL ASSAULT PRESUMPTIVE TESTS
• We had two assignments:
• The first one we took an alternate light source to locate spots on our cloth to which we don’t know if it is seminal fluid or another liquid. We took a sharpie and circled some viable spots to test further. After leaving the dark room, we then prepared to test pieces of the cloth for seminal fluid using the Acid Phosphatase (AP) Test which is a presumptive test.
• The second one we took already collected swabs (oral and vaginal) and then did a P30 confirmatory test for sperm.
SEXUAL ASSAULT ANALYSIS (CLOTH)
SEXUAL ASSAULT ANALYSIS (SWABS)
FIN