Question: The Case: You are forensic detectives. You have arrived at a crime scene where you have found a w…

The Case: You are forensic
detectives. You have arrived at a crime scene where you have found
a woman who has apparently died from multiple stab wounds. There is
blood all around the crime scene. The body is moved to the
coroner’s lab where he finds skin under the fingernails of the
victim. The coroner confirms that the victim died as a result of 5
stab wounds.

The Suspects: The
investigation has led to 2 suspects.

Suspect 1: A man, covered in blood, was
apprehended one block away from the crime scene shortly after the
murder. He claims that a coworker had a mishap with a power tool
and that the blood was the coworker’s. During the police
interrogation, you noticed a deep scratch on the suspect’s face.
The suspect says he has no knowledge of the victim or the
murder.

Suspect 2: The investigation revealed that the
victim had a heated argument with a coworker the day of the murder.
During an interview you noticed this suspect had a scratch mark on
her neck. A search of her vehicle reveals blood droplets on the
carpet. However, the suspect claims to have been nowhere near the
victim on the night of the murder.

Your Task: Your task is to use DNA evidence to
determine if either suspect is lying. Your group will be provided
with DNA samples that have been cut with the same restriction
enzyme. Using gel electrophoresis, separate the fragments and
produce DNA fingerprints for each sample of DNA. Record the results
below.  

MAIN QUESTION: Is either suspect lying? Explain in
arguemtn form with a claim/reasoning, rebuttal, and include
language of science.

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