Crime Scene Investigation

Scene 3: Residence and Surrounding Outside



Note left behind by Tyese Jefferson



Earlier in the day Tyese Jefferson ordered food which was made by Smokey Johnson, who had been the stalker of Jefferson who has a restraining order against Johnson, the drink contained iodine. Jefferson came home, where her dog resides, from work feeling sick, removed articles of clothing and then wrote a note stating “Someone please help me” before dying from the iodine poisoning which resulted from her thyroid problem. Later on Smokey Johnson breaks into her house and retrieves her body then leaves a note stating “You will never find her” and exiting through the yard with her body leaving his footprint and a fingerprint behind and snares her nylon clothing.

The fingerprint that was left behind was a perfect match to Smokey Johnson.

Fingerprint left= Match to Tyese Jefferson



Nylon Fiber possibly worn by Tyese Jefferson







Print left on glass by Tyese Jefferson

 

Heeled shoe worn by Tyese Jefferson



The restraining order that Tyese Jefferson had was a perfect motive for her murder.



Perpetrator
Smokey Johnson



Murder Victim
Tyese Jefferson



Iodine reacts with the thyroid causing Tyese Jefferson's death.



Liquid found containing Iodine



Liquid tested positive for Iodine



Poison

Poisons are substances that can cause disturbances to organisms, usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism.

·         Lye

·         Cyanide

·         Lead

·         Mercury

·         Ammonia

Cause:

·         Skin discoloration

·         Eye bulging

·         Bite marks

In this lab we tested samples for ammonia, metal poisons, iodine, cyanide, asprin, and sugar with indicators that identify the samples with color change and pH paper.

Witness Experiment

In the Witness Experiment the use of facial features to place together and identify a person is helpful when trying to spot your perpetrator. Remembering features as blue eyes, a mole, or a moustache can be helpful when identifying a unique perpetrator. In this experiment we pieced together the facial features of a person after being given time to remember the face.

Drug Analysis

Being able to identify different types of drugs is useful in a crime investigation. The victim could have possibly been administered the drugs or simply overdosed themselves. In this investigation the 6 drug samples of Cocaine, Methamphetamine and LSD were identified using pH strips and identifying reagents.



Footprinting

Footprints are commonly left behind in crime scenes while the perpetrator attempts to quickly get away or carelessly leave the tracks behind. They can lead toward a hidden body or be analysed to find out who left the footprints by size, grove marks, and type of shoe.

1. Collecting Dirt Samples
2. Each member provides a footprint sample

3. Group Analysis of each Footprint
~Fill out provided charts
~Similarities and Differences between footprints

Filled out Chart

Lipstick

Lipstick is a great vehicle for lip prints to be left behind. Lip prints have distinctive characteristics that can be unique to certain people and can be carelessly left behind on cups, cigarette butts, and potentially the victim's body. Analysis through chromatography allows a forensic scientist to analyse the major components of the lipstick. Lip fullness, grooves, dips, etc. are distinguishing characteristics found in lips.

Creating a Profile

Creating a Profile is the act of using the clues left behind at a crime scene to identify possible victims and perpetrators. While creating the profile hair samples, blood samples, or a murder weapon may be found. In this experiment clues were tested using the techniques learned in previous experiments.

Clue 1: Multiple Fingerprints
1: Plain Whorl
2 and 3: Central Pocket Whorl
4: Radial Loop

Clue 2: Asian Hair

Clue 3: Torn up note
"You'll never find her"



Clue 4: Caucasion Hair



Clue 5: Blood Sample