Earmarks as evidence: a critical review

Area of Science:

• Forensic Science
• Biometrics
• Evidence Analysis

Background:

• Earmark evidence is increasingly used in criminal trials.
• There is a significant lack of peer-reviewed scientific literature supporting its use.
• Existing knowledge on earprint variability is insufficient for reliable forensic application.

Purpose of the Study:

• To critically review the current scientific literature on earmark evidence.
• To identify weaknesses in the existing body of knowledge.
• To propose future research directions for earprint analysis.

Main Methods:

• Literature review of scientific publications on earmark and earprint evidence.
• Critical analysis of the methodologies and findings in existing studies.
• Identification of research gaps concerning intra-source and inter-source variability.

Main Results:

• The current scientific literature on earmark evidence is limited and contains significant weaknesses.
• There is a lack of robust statistical data on the variability of earmarks and earprints.
• The reliability of earmark evidence in criminal trials cannot be adequately assessed with current knowledge.

Conclusions:

• The scientific foundation for using earmark evidence in criminal proceedings is underdeveloped.
• Further research is essential to quantify the within-source and between-source variability of earmarks.
• Developing statistical models is crucial for assessing the evidential value of earprints and likelihood ratios.