The effect of electrostatic fingerprint visualization on integrated ballistic identification systems

Area of Science:

• Forensic Science
• Ballistics
• Trace Evidence Analysis

Background:

• Fingerprint enhancement on spent cartridge cases is crucial for forensic investigations.
• Current methods utilize high electrical potential and conducting carbon powder.
• The impact of these enhancement techniques on subsequent ballistic identification has not been previously studied.

Purpose of the Study:

• To evaluate the effect of fingerprint enhancement techniques on ballistic identification.
• To determine if high electrical potential and carbon powder alter firearm-related marks on cartridge cases.

Main Methods:

• Twelve spent cartridge cases (six nickel, six brass) were imaged for ballistic analysis.
• Three nickel and three brass cases were treated with +2500 V for 1 minute.
• Remaining cases were treated with electrical potential and carbon powder, then washed.
• All cases were re-imaged using the same ballistic identification apparatus.

Main Results:

• No discernible visual differences were observed in any of the twelve cartridge cases.
• Neither the application of high electrical potential nor conducting carbon powder altered the examined ballistic features.

Conclusions:

• The tested fingerprint enhancement methods do not visually impact ballistic evidence.
• These techniques can be safely employed without compromising firearm identification analysis.
• Further research may explore quantitative effects on microscopic details.