DNA Case Study Discussion

CASE SCENARIO:

You are a forensic DNA analyst working in an accredited crime laboratory.

Police submit evidence from a home invasion and assault that occurred in a shared apartment. The victim reports struggling with an unknown assailant who fled when a roommate returned home. The scene is processed several hours later.

Evidence Submitted to the lab:

• A kitchen knife recovered from the apartment floor
• A door handle swab from the apartment’s front door
• A torn shirt belonging to the victim

No eyewitnesses could identify the suspect.

DNA Analysis Results:

KNIFE HANDLE

• A mixed DNA profile from at least 3 contributors
• The major contributor is consistent with the victim
• The other DNA contributors are present in very small amounts and only some of their DNA can be analyzed

DOOR HANDLE SWAB:

• A low-level DNA profile consistent with touch DNA
• The DNA amount is barely high enough to be detected

VICTIM’S SHIRT:

• The victim’s DNA is present
• A second DNA profile is detected in small quantities

A suspect is later identified. A reference DNA sample is collected and compared.

• The suspect’s DNA cannot be excluded as a contributor to the minor profile on the shirt
• The suspect is excluded from the knife mixture
• The door handle profile is inconclusive.

DISCUSSION QUESTIONS:

1. What does it mean when a DNA result says a suspect “cannot be excluded,” and why is this different from saying it’s a match?
2. Why are mixed DNA profiles harder to interpret than DNA from a single person?
3. What are some ways a person’s DNA could end up on an object even if they never committed the crime?
4. Why are very small amounts of DNA less reliable, and how does that affect how results should be reported?
5. How should a forensic scientist explain these DNA results so they are not misunderstood by investigators or jurors?

For this discussion, you must post your initial reply first at least 4 complete paragraphs discussing your findings and why),Please use the powerpoints provided Ch 16, DNA . Please no Plagiarism, no ai no chat bots

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