What is a major limitation of bite mark analysis in forensic casework?

• A. It is universally reliable and objective
• B. It proves identity beyond doubt
• C. It has limited scientific reliability and is susceptible to observer bias and coincidental similarities
• D. It is rarely biased or inaccurate

Answer: (C)

The key idea is that bite mark analysis is not a solid, objective science and its conclusions can be unreliable. Bite marks on skin or soft tissue are highly distorted by tissue elasticity, swelling, and healing, so the imprint rarely matches the dentition with precision. As the body changes after injury, the mark can be stretched, distorted, or blurred, and even when photographed or cast, it doesn’t provide a stable, one-to-one map of teeth to marks. This makes it easy for similarities to be misinterpreted as matches.

In addition, the process relies on subjective judgments about which features to compare and how closely they must resemble, which opens the door to observer bias. Investigators’ expectations, knowledge of the case, or familiarity with the suspect can influence judgments, especially when there is no rigorous, blinded, standardized framework. Complicating matters further, many people have dental patterns that can produce superficially similar marks, so apparent matches can arise by chance rather than from a unique dentition. Taken together, these factors mean bite mark analysis has limited scientific reliability and is susceptible to bias and coincidental similarities, limiting its value as definitive evidence.