Which description defines a reference sample?

Which description defines a reference sample?

• A. A sample taken from the suspect's body
• B. A sample used to compare against evidence
• C. A sample used to seal the containers
• D. A random unrelated sample

Answer: (B)

A reference sample is a known material collected specifically to serve as a baseline for comparison with evidence. Its purpose is to determine whether the evidence shares the same source or characteristics, so describing it as “a sample used to compare against evidence” accurately captures its function in the analysis. In practice, reference samples—such as known DNA from a suspect or known materials from a source—are compared directly with the evidentiary material to assess a match. The other descriptions miss the defining role: a sample taken from the suspect’s body could be a reference, but it isn’t defined by that role alone and could be something else in other contexts; a sample used to seal containers is unrelated to establishing a comparison baseline; a random unrelated sample has no connection to the evidence and provides no evaluative purpose.

A reference sample is a known material collected specifically to serve as a baseline for comparison with evidence. Its purpose is to determine whether the evidence shares the same source or characteristics, so describing it as “a sample used to compare against evidence” accurately captures its function in the analysis. In practice, reference samples—such as known DNA from a suspect or known materials from a source—are compared directly with the evidentiary material to assess a match.

The other descriptions miss the defining role: a sample taken from the suspect’s body could be a reference, but it isn’t defined by that role alone and could be something else in other contexts; a sample used to seal containers is unrelated to establishing a comparison baseline; a random unrelated sample has no connection to the evidence and provides no evaluative purpose.