What term is used for a sample that serves as a baseline for comparing crime scene evidence?

What term is used for a sample that serves as a baseline for comparing crime scene evidence?

• A. Reference sample
• B. Exemplar
• C. Control
• D. Standard

Answer: (A)

The main idea here is using a known, source-origin sample to establish a baseline for comparison with crime scene evidence. This known sample is called a reference sample. By collecting a reference sample from a person, object, or material that is believed to be the source, analysts can compare it directly with the evidence to see if they originate from the same source. For example, a suspect’s DNA or fibers taken from a known item can be compared to what’s found at the scene to assess a match or exclusion. A control is used to verify that the testing process itself worked correctly, not to identify whether evidence came from the suspect. A standard is typically an instrument calibration or a reference material used to ensure measurements are accurate, rather than a direct source comparison. An exemplar might be a typical sample used for general comparison, but the established term for the case-specific baseline source is reference sample.

The main idea here is using a known, source-origin sample to establish a baseline for comparison with crime scene evidence. This known sample is called a reference sample. By collecting a reference sample from a person, object, or material that is believed to be the source, analysts can compare it directly with the evidence to see if they originate from the same source. For example, a suspect’s DNA or fibers taken from a known item can be compared to what’s found at the scene to assess a match or exclusion.

A control is used to verify that the testing process itself worked correctly, not to identify whether evidence came from the suspect. A standard is typically an instrument calibration or a reference material used to ensure measurements are accurate, rather than a direct source comparison. An exemplar might be a typical sample used for general comparison, but the established term for the case-specific baseline source is reference sample.