Identifying the source of bullet wipe: a randomised blind trial.

Area of Science:

• Forensic Science
• Materials Science
• Analytical Chemistry

Background:

• Bullet wipe, a residue left by a bullet, contains unique chemical signatures.
• Matching bullet wipe to specific bullet types is crucial for forensic ballistics.

Purpose of the Study:

• To evaluate the efficacy of scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS) for bullet wipe analysis.
• To determine if SEM and EDS can reliably match bullet wipe evidence to a specific bullet.

Main Methods:

• Scanning electron microscopy (SEM) was employed to examine the morphology of bullet wipe.
• Energy dispersive x-ray spectroscopy (EDS) was used to determine the elemental composition of the bullet wipe residue.
• Analysis focused on comparing residue from test firings with crime scene evidence.

Main Results:

• SEM provided detailed morphological information about the bullet wipe.
• EDS successfully identified characteristic elemental compositions within the bullet wipe.
• The combined SEM-EDS analysis demonstrated potential for matching bullet wipe to bullet types.

Conclusions:

• SEM and EDS are valuable tools for the forensic analysis of bullet wipe.
• These techniques enhance the ability to link bullets to crime scenes through residue analysis.
• Further research can refine these methods for improved forensic casework.