In a case involving hairs, DNA under fingernails, and bite marks, which types of evidence would be useful?

• A. Hairs, DNA under fingernails, and bite marks
• B. Only floor dust
• C. Only clothing
• D. Photographs

Answer: (A)

Biological and trace evidence that can directly link a suspect to the scene or the victim is what helps in this kind of case. Hairs found at the scene can be examined microscopically for characteristics and, if a root or follicular tag is present, may yield DNA. DNA under the fingernails is especially valuable when a victim may have scratched the attacker, because it can contain skin cells or other genetic material from the person who inflicted the harm. Bite-mark evidence allows a comparison between the offender’s dental pattern and the mark to support or challenge a potential match, helping to establish who was involved and the nature of contact. Floor dust or clothing can carry traces but aren’t as directly tied to the specific elements described, and photographs, while essential for documenting injuries and the scene, don’t provide the same targeted physical links on their own. Taken together, hairs, DNA under fingernails, and bite marks give the strongest direct evidence in this scenario.