Washington State Patrol Crime Laboratory

Marysville, WA, United States

Washington State Patrol Crime Laboratory

Marysville, WA, United States

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Harruff R.C.,King County Medical Examiners Office | Park J.,Miami Dade County Medical Examiner | Smelser B.J.,Washington State Patrol Crime Laboratory
Journal of Forensic Sciences | Year: 2013

Wounds of high-energy centerfire rifles and shotguns represent distinctive injuries of forensic importance. Previous studies of contact wounds have shown variability in the potential of these weapons to produce bursting wounds of the head. The present study analyzed contact head wounds owing to 26 centerfire rifles and nine shotgun slugs and compared them with respect to weapon, ammunition, entry wound site, and projectile kinetic energy. The bursting effect, defined for this study as disruption of at least 50% of the head, occurred in 25/35 of cases and was related to kinetic energy. Bursting was associated with energies <2700 ft-lbs in 12/22 cases and energies >2700 ft-lbs in 13/13 cases. The volume of gunpowder gas injected into the wound was considered as contributing to the bursting phenomenon. There was no relation of bursting to the specific entrance wound site, type of ammunition, or projectile fragmentation. © 2012 American Academy of Forensic Sciences.


PubMed | Washington State Patrol Crime Laboratory and McCrone Associates Inc.
Type: Journal Article | Journal: Forensic science review | Year: 2015

Microscopic trace evidence includes particles from many sources such as biologicals, soil, building materials, metals, explosives, gunshot residues, and cosmetics. The particles are identified by morphological analysis, microscopy, and chemical analysis. Their identity is confirmed by comparison with reference materials or other comparison samples. The probative value of particles of forensic interest depends on their nature and the circumstances of their presence.


Wilson D.K.,Washington State Patrol Crime Laboratory | Graff C.L.,Washington State Patrol Crime Laboratory
Journal of Forensic Sciences | Year: 2013

An unknown, viscous, opaque, white liquid with a strong, unpleasant odor was submitted with a request for identification. It was analyzed using infrared (IR) spectroscopy, gas chromatography-mass spectrometry, and X-ray fluorescence spectroscopy. It was found to contain glycerin as well as another compound. IR and mass spectral data were readily obtained for this second component, but it was not easily identified as common instrument libraries had no matching spectra. After an extensive literature search, the unknown compound was identified as spiromesifen, a recently introduced pesticide. The IR spectrum and electron impact mass spectrum of spiromesifen are presented here as these are not available in the published literature. This case report also provides useful approaches for searching for and identifying an unknown compound when it is not found in a laboratory's spectral libraries. © 2012 American Academy of Forensic Sciences.


Casey L.,Washington State Patrol Crime Laboratory | Engen S.,Eastern Washington University | Frank G.,Washington State Patrol Crime Laboratory
Journal of Forensic Sciences | Year: 2013

The distribution of DNA on the filter paper of smoked cigarette butts was quantitatively mapped using real-time quantitative polymerase chain reaction. The filter papers from smoked cigarette butts collected from indoor and outdoor sources were sliced into equal pieces and the amount of DNA on each slice was determined. This study found that the cigarette butt filter papers sliced parallel to the seam of the cigarette had more uniformly distributed DNA on the slices and in most cases, there was enough DNA on each slice to obtain a complete DNA profile. The perpendicular slices had a less uniform pattern of distribution and some slices did not have enough DNA to obtain an interpretable DNA profile. Cigarette butts found indoors also had more DNA per cigarette on average than cigarette butts found outdoors. © 2013 American Academy of Forensic Sciences.


PubMed | Washington State Patrol Crime Laboratory
Type: Journal Article | Journal: Journal of forensic sciences | Year: 2013

An unknown, viscous, opaque, white liquid with a strong, unpleasant odor was submitted with a request for identification. It was analyzed using infrared (IR) spectroscopy, gas chromatography-mass spectrometry, and X-ray fluorescence spectroscopy. It was found to contain glycerin as well as another compound. IR and mass spectral data were readily obtained for this second component, but it was not easily identified as common instrument libraries had no matching spectra. After an extensive literature search, the unknown compound was identified as spiromesifen, a recently introduced pesticide. The IR spectrum and electron impact mass spectrum of spiromesifen are presented here as these are not available in the published literature. This case report also provides useful approaches for searching for and identifying an unknown compound when it is not found in a laboratorys spectral libraries.

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