Mock Crime Scene -- Table Lab Report

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Take simulated anti-A, anti-B, and anti-D and place a drop onto the labeled sections on the plate

4. Using an clean dropped drop the questioned blood into each of the three sections

5. Using a clean toothpick for each section, mix the blood

6. The formation of clumps shows that there is that type of antigen in the blood.

Observation:

Blood:

Anti-A serum

Anti-B serum

Anti-D serum

Resulting Blood Type

The victims' blood: Kenny-11811B3:

No clumping

No clumping

No clumping

O-

Blood #1 found at scene- 11811B2

Clumping

Clumping

Clumping

AB+

Blood #2 found at scene- 11811B1

No clumping

No clumping

No clumping

O-

Suspect 1: Stan- 11811B6

No clumping

Clumping

No clumping

B-

Suspect 2: Cartman- 11811B4

Clumping

No clumping

Clumping

A+

Suspect 3: Kyle- 11811B5

Clumping

Clumping

Clumping

AB+

From the above chart one can see that:

1. Blood #2 found at scene belonged to the victim

2. Thus blood #1 found at scene belongs to the suspect

3. After analyzing the suspects, Kyle's blood matched the blood found at the scene and due to all the other evidence (from the other sections of the lab) we were able to conclude that that perpetrator was Kyle.

Hair Evidence -- The only hair was that of the victim, no other matches were made or are relevant.

Processessing of Evidence

Fingerprints -- There were none taken at the scene, but dusting and tape lifting would have been used if there had been evidence; then compared for ridge patters of suspects or database.

Hair -- if root was attached, DNA using PCR technology; if not, microscopic examination and 15-20 representative samples to compare.

Blood -- RFLP, DNA Analysis, Precipitin test, comparative analysis

Footprints -- precise measurements and castings, comparison to suspects or national database for information

Drugs -- spectrographic or chemical analysis, depending on type and substance (powder, liquid, solid, etc.) (Schiro, 2010).

Suspect List and Exclusion, Inclusion -- The officers found only four boys at the scene, identified previously as Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick. The boys ran from the scene, but warrants were secured to take hair, blood, and shoe prints from all four. The results were thus:

Suspect

Hair

Shoe

Drugs

Blood

Broflovski, K.

Inconclusive

Closest Match, .

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5 cm off.

66% match

100% match

Cartman, E.

Inconclusive

No Match

33% match

No Match

Marsh, S.

Inconclusive

No Match

50% match

No Match

McCormick, K.

Inconclusive

No Match

50% match

No Match

Crime Scene Recreation -- It would be quite easy to say, based on the physical evidence, that Kyle was the murderer in this case. However, we must not forget the psychological evidence and the interviews done with other students, family members, and teachers. All interviews share one thing in common -- that the boys were almost inseparable in their pranks and activities, with Kenny often being the brunt of their jokes and misdeeds. When investigators interviewed all suspects separately, each incriminated another part of the group. This suggests that instead, this may have been a group activity. Kyle may be, at times, the ringleader of the group, certainly he was the one who first pointed to his friends and said, "they killed Kenny."

In fact, based on interviews, we believe that the entire event was not necessarily a planned or premeditated murder, but a childish prank gone wrong. It turns out that Cartman's grandfather recently returned from a trip abroad, and brought Cartman's father a collectible sword, knowing his passion for antique weapons. His father hung the sword in his den, but the item went missing on the afternoon of the 8th of November. Cartman likely brought the sword to his afterschool play time, and the group decided they would have an old-fashioned sword fight. Kenny, being the smallest, was teased and tormented, and, in a fit of pique, Kyle held him up to the wall and called on one of the others to "hang this balckard by the post, mateys," emulating the pirate game they were playing. This puts Kyle's footprints and blood spatter residue conclusive with the evidence, and also the proximity to the victim when officer's arrived. Because it was rather cold in South Park, the boy's all had gloves on, making fingerprinting impossible. Subsequent interrogation….....

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