Related Experiment Videos
Staining in firearm barrels after experimental contact shots
C Schyma1, K Bauer1, J Brünig1
1Institute of Forensic Medicine of the University of Bern, Bühlstrasse 20, CH-3012 Bern, Switzerland.
Forensic Science International
|February 20, 2017
Summary
Biological traces are found in firearm barrels after contact shots. This study simulated contact shots, revealing distinct staining patterns within barrels, offering insights comparable to real suicide cases.
Area of Science:
- Forensic Science
- Ballistics
- Trace Evidence Analysis
Background:
- Biological traces, such as blood and tissue, can be deposited inside firearm barrels following close-range or contact shots.
- Understanding the distribution and patterns of this staining is crucial for forensic investigations.
Purpose of the Study:
- To simulate and evaluate biological staining within firearm barrels after contact shots.
- To analyze the extent and patterns of trace evidence deposition from the muzzle to the chamber.
Main Methods:
- Utilized five handguns (.22 LR, 7.65mm Browning, 9mm Luger, .38 Special) with 4-inch barrels.
- Performed 24 contact shots on gelatine-filled, silicone-coated box models using the triple contrast method.
- Documented staining via endoscopy and analyzed barrel swabs using quantitative PCR.
Main Results:
- Distinct biological staining was observed in all tested firearms except the .22 revolver.
- Staining decreased from the muzzle towards the rear of the barrel.
- In 14 of 24 shots, staining extended into the firearm's chamber.
Conclusions:
- Simulated contact shots reliably produce biological staining within firearm barrels.
- The observed staining patterns and extent are comparable to findings in actual suicide cases.
- This research provides valuable data for the forensic analysis of firearm evidence.