Forensics Project Part X: Crime Scene Investigation!

DO NOT CROSS!  Crime scene investigation in process!  A domestic crime was committed and the brilliant investigators of my class are going to find out what happened. In class, three crime scenes were simulated around the room and ten possible suspects and two animals (a cat and a dog) were displayed on the board in the front of the room for each student to analyze as a the possible criminal.   A group of four students were assigned to each of the crime scenes.  I was assigned crime scene three which was a domestic crime.

In the crime scene were a total of twelve clues to be analyzed.

Clue 1 was a black high heeled woman’s shoe with a pointed tip.  The shoe had a bow, a strap, was a size eight and was designed by Claudia:

Clue 2 was a ripped up note which said: “Someone help me please”:

Clue 2A was another ripped up note that said: “You’ll never find her”:

Clue 3 was a plain whorl fingerprint:

Clue 3A was another fingerprint which was an ulnar loop:

Clue 4 was a gold, open, tear-dropped shaped earing with chains rapped around the center piece of the earing for the design:

Clue 5 was a green and white fiber which, with further analysis, was determined as nylon:

Clue 6 was a clear, yellow liquid that was a possible poison.  When we analyzed the substance we found iodine in the sample:

Clue 7 was a footprint in soil.  The footprint was determined to be from a male wearing Vans.  The size of the print being 30cm long and 11cm wide was how we determined that it was a male print because males usually have larger feet than females.  The pattern on the bottom of the shoe was how we determined the shoes were Vans because another group member was wearing the same type of shoe:

Clue 8 was a sample of A+ blood found at the crime scene:

Clues 9 were hairs found at the scene.  With further analysis we identified the hair as dog hair:

Clue 10 was a fingerprint found at the scene that needed to be lifted.  When we lifted the print we found that it was an ulnar loop:

When our group completed the analysis of the clues found at the crime scene, we went to the board at the front of the room to interrogate the possible criminal and victim.  The dog hair at the crime could only belong to the dog, Tyson.  My group believed the victim of the crime was Tyese Jefferson because the shoe and earing found were a woman’s, the handwriting in clue 2 matched the handwriting of Jefferson, the fingerprint in clue 3A and the one that was lifted matched her ulnar loop print, she had Thyroid problems and iodine (found in the poison of clue 6) is poisonous to those with Thyroid issues and the blood found matched her A+ blood type.  My group believed the criminal was Smokey Johnson because a plain whorl print found at the crime scene matched his, the handwriting in clue 2A matched his handwriting and the footprint at the crime scene belonged to a male.  I later assumed that the restraining order put on Johnson was from Tyese Jefferson.

Finally, after determining what each clue was and the criminal and victim at the scene, we each came up with a scenario that fit the scene of the crime.  I thought that this was a kidnapping because there was no body found and the note in clue 2A implies that Johnson is holding her captive and is challenging the investigators.  It started like this.  Tyese Jefferson was counseling a troubled boy name Smokey Johnson who owned a golden retriever named Tyson.  Johnson developed feelings for Tyese and started to stalk her.  She then put a restraining order on him.  Johnson, who could not bear to be apart from Tyese, went to her house one night with a green nylon rope and a plan. He parked his truck on the road in front of her house, as to not leave any tire tracks, and walked up to her house, stepping on a dirt patch leaving his footprint.  *I assumed it was left there when he was approaching the house before the crime took place because the print looks rather relaxed as if he were walking and if he were dragging a body with him leaving the crime then the print would have been dug deeper into the ground.  He looked inside her house through the window leaving some fingerprints behind (plain whorl).  Tyese was upstairs when she heard Johnson break in through the back door and, in her panic, could not find her phone so she quickly wrote “someone help me please” on a nearby notepad as to notify anyone who could help.  Johnson came upstairs with his green, nylon rope and attacked Tyese.  In the struggle her earing was ripped out spilling blood, her shoe fell off and some of Tyson’s hair fell off of Johnson’s clothes.  After overpowering Tyese, Johnson tied her up with the green nylon rope but in his haste ripped of a couple of its fibers leaving some green and un-dyed parts of the rope at the crime scene.  Johnson, knowing Tyese had a Thyroid issue after stalking her, then force fed her just enough iodine to knock her unconscious.  As he was gathering up her body to be put into the truck, Johnson noticed the note scrawled on the notepad and ripped it up.  He then decided to leave a note of his own saying “you’ll never find her” but then realized that the brilliant crime scene investigators could analyze the handwriting and compare it to his so he tore up his note as well and then left with an unconscious Tyese in the back of his truck.         

Forensics Project Part IX: Poison Analysis

In class, we did an experiment where we tested various substances at six stations around the room to first identify whether the mixture was a poison and then determine whether the substances were the specific type of poison that station’s reagent was testing or not.  We were separated into groups of four and at each station there were specific reagents which would check for a certain type of poison: a household cleaning product, aspirin, cyanide, metal poison, sugar or iodine.  As we rotated around the room we would test the sample’s pH and its classification (household cleaning product, aspirin, cyanide, metal poison, sugar, iodine) and then record our results for each station.  Before we started the experiment however, we had a discussion in class about the various ways to poison somebody with little chance of being caught.  We learned that if one is trying to murder somebody who is diabetic, they can continuously feed them doses of sugar until they overdose.  We also learned that those with Thyroid conditions can be poisoned by iodine.  I thought this was rather interesting because the best way somebody could kill someone by poisoning is by making the murder look like an accident and these previous examples show just that.  Learning this allows me to better imagine what happened at a crime and know more about the different situations that could be encountered by crime scene investigators. 

Forensics Project Part VIII: Drug Analysis

In class, we did an activity which simulated the testing for the drugs LSD and cocaine.  Of course, we could not use the real drugs in school so we used substances that would create the same results as the real drugs when exposed to the drug’s revealing reagent.  Six stations were set up around the room with unknown drugs to be identified as LSD or cocaine by the students who would rotate in groups around the room to each station.  At each station was a beaker filled with approximately 25ml of water and the unknown drug mixed thoroughly together.  The groups would then use a pipette to drop a couple of drops of the mixture into a provide plate and test the pH of the substance.  We would then rinse out the plates and add a couple more drops of the solution to the plate (in separate piles) and put a drop of each of the revealing reagents into the separate mixture piles to determine which drug the station held.

 

Background Research on the Drugs:

Cocaine

Chemical Name: benzoylmethylecgonine

Chemical Formula: C17H21NO4

pH: 8

Biochemical Tests: chromatographic techniques can easily distinguish and separately measure each of these substances

LSD

Chemical Name: Lysergic acid diethylamide

Chemical Formula: C20H25N3O

pH: 4

Biochemical Tests: comparing the hallucinogen LSD with lisuride, a structurally similar drug that also acts on serotonin or 5HT2A receptors but is not hallucinogenic

Forensics Project Part VII: Footprint Analysis

In class, we did an activity which involved a group of four students analyzing each other’s footprints in the dirt from a simulated crime scene.  Each group had a bin filled with dirt to represent the ground at the crime scene.  Each student in the group would press their foot into the dirt leaving a print behind.  We then would record the weather conditions (which would be the same for each trial), which direction the print was going, the length and width of the print and any designs on the sole of the shoe.  There was a boy (Brad Caison) and two other girls (LaTaysha Stokes and Jenifer Perez) in my group besides myself.  When we observed his print, we noticed Brad had rather large feet because he is a male and that was seen in his print.  Jenifer had a very small print and LaTaysha was wearing a type of combat or construction boot so when one analyzed her print it appeared to be a male’s print instead of a female’s.  When we analyzed my print we observed that more pressure is put on my heel instead of being equally distributed like the others'. 

  My Footprint:

Forensics Project Part VI: Witness Experiment

            In class, in our groups of three or four, we did an activity which tested our ability as an eye witness and whether or not we were good witnesses.  First, each person in the group found a similar sized face in a magazine.  If the faces were too different in size it would be too easy to recognize which facial features belonged to which face.  We then cut out the features of each face (hair, eyes, nose and mouth) and reassembled the faces to make an accurate portrayal of what the face originally was.  Each person then disassembled the faces and passed the pieces to the person on their left.  That person would then put the pieces together to make the original face.  After that, each person put each feature into a designated pile in the middle of the table (one pile for eyes, one pile for hair, one pile for noses and one pile for mouths) mixing up all the facial features of the different faces.  Finally, everyone would reassemble their original faces from the piles at the middle of the table.

            This activity, in my opinion, was rather easy.  I do, however, believe it would have been more difficult if there were more people in my group because I only had two other students besides myself doing this activity with me. 

      

Forensics Project Part V: Create a Profile

In class, we were separated into groups of four or five to analyze five different clues found at a fake crime scene and make a profile of the criminal and the crime.  The clues were labeled one through five. Clue one was a set of four fingerprints from the right hand of somebody at the scene of the crime labeled one through four.  Our group identified print one to be a plain whorl, print two and three to be a double loop and print four to be an ulnar loop.  Clue two was a hair sample and when our group observed the evidence we thought it looked like it came from a Caucasian person with light brown or blonde hair.  Clue three was a note left by the kidnapper or murderer saying “You will never find her!”  The handwriting in the note looked loopy and could have possibly been written by a female.  This also let us know the victim was a female.  The handwriting also looked rushed meaning the criminal felt rushed.  Clue four was another hair sample which the grouped determined was from a dog or cat.  In the end we decided it looked more like cat hair than dog.  Clue five was a red fluid on a piece of paper.  Our group never identified what this was and I still do not know what it is. 

After observing and identifying all of these clues our group created the profile of the criminal and the crime.  We determined that there was a female victim, the criminal could also possibly be female due to the writing, the criminal looked rushed due to the writing in the note, the criminal seems to be instigating the crime investigators due to what the note says, either the victim or the criminal has light brown or blonde hair and either the victim or the criminal owns a cat. 

            Finally, after creating the profile from the known information we obtained from the evidence our group determined what the next steps in this investigation would be to continue on in the investigation.  We said that further testing would need to be taken on clue five to determine what it was and to find the victim to see if clue two (light brown/blonde hair) belonged to her and whether or not she owns a cat.     

Forensics Project Part IV: Lipstick Print Analysis

1. Day One of Lipstick Analysis

            In class, we did an activity which involved each person to analyze a print of their own lips.  Each person would put on lipstick or lip gloss and press their lips against a blank notecard.  We would then wipe the lipstick from our lips (or keep it on, whatever we preferred) and look at the print left on the card.  Each student would then identify distinct characteristics of their lips on the print left on the card.  For instance, on the print of my lips I noticed that my lips were rather full and they were horizontally long.  I also observed that my top and bottom lip are similar in size and that there is a very small dip in my upper lip.  There were also many small striations in my lips that could not be seen until the print was looked at more intently.

2. Day Two of Lipstick Analysis

            The next day in class, each group (4 or 5 students) was given a different group’s lipstick prints to analyze and then they were told to try to figure out who they belong to.  I, however, was not attending school that day therefore I did not take part in this activity and cannot give sufficient information about what took place besides what the activity was about.