How can accidental transfer of DNA impact a crime scene investigation? In addition, explain why accidental DNA transfer cannot be used as an excuse to throw away all DNA evidence found at a crime scene?

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Answer:

orensically valuable DNA can be found on evidence that is decades old. However, several factors can affect the DNA left at a crime scene, including environmental factors (e.g., heat, sunlight, moisture, bacteria, and mold). Therefore, not all DNA evidence will result in a usable DNA profile.

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