Evaluation of an electronic comparison system and implementation of a quantitative effectiveness criterion

Area of Science:

• Forensic Science
• Ballistics
• Criminalistics

Background:

• Microscopic comparison of fired bullets and cartridge cases is time-consuming.
• Electronic comparison systems have been developed to aid in pre-selection.
• The BKA (Federal Criminal Police Office, Germany) utilizes an electronic comparison system.

Purpose of the Study:

• To evaluate the effectiveness of an electronic comparison system.
• To propose a mathematical value for rating correlation quality.
• To discuss system applicability across different calibres and land engraved area (LEA) widths.

Main Methods:

• Evaluation of an electronic comparison system based on an extensive database.
• Development of a mathematical criterion for correlation quality assessment.
• Analysis of system performance with varying calibres and LEA widths.

Main Results:

• A proposed mathematical value provides an objective assessment of correlation quality.
• The electronic system demonstrates applicability across different calibres and LEA widths.
• The study discusses the utility of 'scores' in decision-making for forensic identification.

Conclusions:

• Electronic comparison systems offer a significant improvement over traditional microscopic methods.
• The proposed mathematical criterion enhances the objectivity of evaluating forensic comparison systems.
• Further analysis of system scores can aid in forensic decision-making processes.