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Laser Ablation Forensic Tool for the End User

. New Wave Research 213 nm Nd:YAG Laser Connected to a ICP-MS. Laser Ablation in a Forensic Laboratory. Advantages of Laser Ablation in Forensic Science Applications. Minimal Sample Size and ConsumptionTypical minimum sample size of ~300 x 300 x 100 micronsApproximately 300 ng of sample consumed during analysisMinimal Sample PreparationCoupled with an ICP-MS system provides rapid multi-element detectionParts per billion elemental detection limitsCurrently the most discriminating examination for the elemental profiling of glass evidence.

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Laser Ablation Forensic Tool for the End User

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    1. Laser Ablation Forensic Tool for the End User I am a Forensic Alcohol Supervisor certified by the State of California Department of Health Services. A criminalist is concerned with the recognition, identification and evaluation of evidence, ensuring the security and integrity to protect the sample from loss, cross transfer, contamination and deleterious change, using accepted scientific methods to draw an opinion in the matters of legal significance.I am a Forensic Alcohol Supervisor certified by the State of California Department of Health Services. A criminalist is concerned with the recognition, identification and evaluation of evidence, ensuring the security and integrity to protect the sample from loss, cross transfer, contamination and deleterious change, using accepted scientific methods to draw an opinion in the matters of legal significance.

    2. Laser Ablation in a Forensic Laboratory

    3. Advantages of Laser Ablation in Forensic Science Applications Minimal Sample Size and Consumption Typical minimum sample size of ~300 x 300 x 100 microns Approximately 300 ng of sample consumed during analysis Minimal Sample Preparation Coupled with an ICP-MS system provides rapid multi-element detection Parts per billion elemental detection limits Currently the most discriminating examination for the elemental profiling of glass evidence

    4. Laser Ablation – Forensic Science End-User Of the approximately 400 Forensic Laboratories in the United States - 12 laboratories have adopted the Laser Ablation-ICMP-MS technique for the elemental analysis of trace evidence Types of physical evidence that can be examined using Laser Ablation Glass Paint and Polymers Paper Tapes Inks Type of cases examined has included Homicide Cases, Hit and Run Cases, and Burglary Cases Research projects conducted by our laboratory Elemental Profiling of Automotive Windshield Glass (NIJ Funded Project) Elemental Profiling of Soda-Lime Container Glass

    5. Laser Ablation and the End-User

    6. Current Status of Laser Ablation in Forensic Science Laboratories Drafting an ASTM Guideline for Analysis of Glass by Laser Ablation – ICP-MS Elemental Analysis Working Group (EAWG) National Institute of Justice (NIJ) sponsored funding for research in the elemental analysis of forensic evidence

    7. Special Thanks American Chemical Society (ACS) Audrey Leath Optical Society of America (OSA) Laura Kolton Moderator and Panelists Tom Baer, Stanford Photonics Research Center, Stanford University Jose Almirall, International Forensic Research Institute, Florida International University Steve Rehse, Wayne State University Richard Hark, Juniata College Sacramento County District Attorney’s Office Laboratory of Forensic Services Jan Scully, District Attorney Robert A. Jarzen, Laboratory Director

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