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How far away was the gun from Patrick Duffey?

October 30, 2015 / 01:52

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.

TLDR

Forensic ballistics tests reveal gunshot residue patterns and firing distances related to a decedent's head.

Episode

1:52
00:00:00
what kind of test did you do so I fired shots using the firearm and ammunition recovered from the Duffy residence into
00:00:10
a skin simulant in this case I used a cotton cloth material and I fire shots at known distances and what I'm trying
00:00:17
to do is duplicate the stippling pattern that I observed on the decedent's head so in this case I'm going to fire one
00:00:27
shot uh Within six inch of this cloth so you can see what I've created here is a a dense gunpowder particle
00:00:48
pattern and I can then measure the diameter of this pattern and compare it to the stippling pattern on the Dean's
00:00:56
head it's almost like a bullseye if I yeah so what we see here is is is smoke uh combined with the gunpowder particles
00:01:05
so farther away you'd have a different pattern that's correct so uh this time I'm going to fire at a distance of
00:01:11
greater than one foot and what we will see is that the gunpowder particle pattern is larger and more
00:01:25
diffuse barely see it so you can see here there's a noticeable difference in the gun powder
00:01:30
particle size and density so how far do you think she was when I conducted my testing I determined that the muzzle of
00:01:39
the firearm was between a distance of one and seven inches from his head um specifically I produced a pattern that
00:01:46
most resembled the pattern on the decedent's head uh at about 3 to 5 inch

Episode Highlights

  • Gunpowder Patterns Explained
    The expert explains how distance affects gunpowder particle patterns on skin.
    “There's a noticeable difference in the gun powder particle size and density.”
    @ 01m 28s
    October 30, 2015
  • Muzzle Distance Determined
    Testing reveals the firearm was between one and seven inches from the decedent's head.
    “I determined that the muzzle of the firearm was between one and seven inches from his head.”
    @ 01m 39s
    October 30, 2015

Episode Quotes

  • 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?

Key Moments

  • Gunpowder Analysis00:05
  • Distance Impact01:07
  • Final Findings01:39