
This episode discusses forensic ballistics, specifically testing gunshot residue patterns on skin simulants. Key topics include the stippling pattern observed on a decedent's head and the distance from which shots were fired.
The guest explains the process of firing shots using a firearm and ammunition recovered from the Duffy residence into a cotton cloth material. This method aims to replicate the stippling pattern found on the victim's head.
Measurements are taken to compare the gunpowder particle patterns created at various distances, revealing how distance affects the size and density of the patterns.
Through testing, the guest concludes that the muzzle of the firearm was between one and seven inches from the victim's head, with the closest resemblance to the decedent's stippling pattern occurring at three to five inches.
Forensic ballistics tests reveal gunshot residue patterns and firing distances related to a decedent's head.

It's almost like a bullseye.How far away was the gun from Patrick Duffey?
There's a noticeable difference in the gun powder particle size and density.How far away was the gun from Patrick Duffey?