1. Gunshot Residue

2. Gun Shot Residue (GSR) What is gun shot residue (GSR)?
What crimes are GSR involved in?
How is GSR collected?
How is GSR analyzed in the lab?

3. What is GSR?
Mixture of materials that originate from the firing of a gun.
From the chamber
From the barrel

4. What is GSR?
GSR will fall onto hands of person firing the gun.

5. What crime is GSR involved in?
Crimes with guns

6. How is GSR collected & analyzed?
Hand/glove/paw is swabbed
Analysis:
Elements barium and antimony are found in high levels.
Use powerful microscopy (SEM)
Use chemical tests (color change reactions)