PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network

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Physical Evidence Manual Do not package standards with evidence fibers, or allow them to be near or in contact with each other. This could allow cross contamination to occur. Adhesive lifts are NOT acceptable for collection of standards. Adopted: May 2002 Revisions: 6 Last Revision: January 31, 2008 9-3
Physical Evidence Manual 10.0 FINGERPRINTS (FRICTION RIDGE SKIN) <strong>EVIDENCE</strong> Fingerprints (friction ridge skin) are a widely recognized means of personal identification and their individuality and permanence make friction ridge skin identification one of the most valuable forms of evidence. Most crime scene evidence has the potential to reveal identifiable latent print impressions so assume that latent prints are present on all objects handled by the perpetrator and process or collect these pieces of evidence accordingly. By examining the evidence submitted, the laboratory will be able to: • Determine the presence of latent, patent or plastic print impressions. • Determine if these print impressions are identifiable. • Compare and identify these print impressions with the known friction ridge print impressions of suspects and those of others for elimination purposes. • Search for a possible latent donor by utilizing the Automated Fingerprint Identification System (AFIS) to establish a list of potential candidates. The Latent Print Laboratories are currently located in Bend, Central Point, Portland Metro, and Springfield. Collection, Packaging, and Submission of Evidence Evidence collected from the crime scene for latent examination should be submitted as an analytical case using the Forensic Services Request (Form 49). Exhibits being forwarded to a laboratory should be initialed and dated when practical. Take care, however, when marking the items that these marks are not placed in an area which would likely obliterate any latent prints present. If insufficient space exists for initialing, place the item in a bag, seal and properly mark the exterior. The item should be packaged so that no rubbing action occurs as this may destroy latent fingerprints present on the object. Evidence should be submitted for examination as soon as possible after its discovery. Exposure to water or dampness should be avoided. However, this exposure does not necessarily destroy all latent prints. Any wet or damp object must be air-dried before it is packed for shipment. Unless absolutely necessary, do not process items of evidence which are to be submitted for latent prints. If items have been processed prior to submission to a laboratory, package those items to prevent smudging of the latent prints or possible breakage. All chemical processing of items should only be done by trained latent examiner or technician in the laboratory setting. Identify all evidence, whether an original article, a lift, photographic negative or image CD/DVD with a tag or a mark placed so it will not interfere with the latent Adopted: May 2002 10-4 Revisions: 6 Last Revision: January 31, 2008
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