What is the difference between class evidence and individual evidence, and give an example of each?

What is the difference between class evidence and individual evidence, and give an example of each?

• A. Class evidence narrows to a single source; fingerprint is individual evidence
• B. Class evidence narrows to a group (e.g., blood type); fingerprint is individual evidence
• C. Class evidence narrows to a group (e.g., blood type); hair is class
• D. Class evidence and individual evidence refer to the same concept

Answer: (B)

The main idea being tested is how evidence is categorized by how specifically it can point to a source. Class evidence points to a group with shared characteristics, narrowing the field but not identifying a single source. Individual evidence ties to a single source with a high degree of certainty. Blood type is a classic example of class evidence because a person’s blood type is shared by many individuals. Finding a blood type at a crime scene can reduce the pool of potential sources to those who have that type, but it cannot single out one person. Fingerprints, on the other hand, are considered individual evidence because the unique ridge patterns in a fingerprint can be used to link a print to a specific person, given a sufficient and quality match. That’s why this option is the best choice: it correctly categorizes blood type as class evidence and fingerprint as individual evidence.

The main idea being tested is how evidence is categorized by how specifically it can point to a source. Class evidence points to a group with shared characteristics, narrowing the field but not identifying a single source. Individual evidence ties to a single source with a high degree of certainty.

Blood type is a classic example of class evidence because a person’s blood type is shared by many individuals. Finding a blood type at a crime scene can reduce the pool of potential sources to those who have that type, but it cannot single out one person.

Fingerprints, on the other hand, are considered individual evidence because the unique ridge patterns in a fingerprint can be used to link a print to a specific person, given a sufficient and quality match.

That’s why this option is the best choice: it correctly categorizes blood type as class evidence and fingerprint as individual evidence.