Chem427_latentprints_s08 - CHEM/FRNSC 427W Latent...

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1 CHEM/FRNSC 427W Latent Fingerprints Spring 2008 Format. The latent fingerprints module will cover the material below: 1. Biology and physiology of fingerprints 2. Latent fingerprint development techniques 3. Chemistry of cyanoacrylate fuming 4. Imaging of cyanoacrylate-enhanced fingerprints The module consists of a set of open-ended guided-inquiry laboratory exercises to familiarize the student with the practice and chemistry of cyanoacrylate-based fuming of latent fingerprint residue. There are few explicit instructions. Although the focus is on cyanoacrylate fuming, the student will study and familiarize themselves with the nature of friction ridge skin, ridge characteristics, the anatomy of the hands and feet, the general chemical composition of sweat and latent fingerprint residue, and common procedures and techniques for processing crime scenes and evidentiary items for the recovery of latent prints. The student will be required to become knowledgeable in the choice and application of latent development techniques. Your approach should be to read through the material (this packet, lecture notes, text, and references) and develop a plan-of-action. Objectives. After completing this module, you should be able to: 1. Lift or preserve latent impressions on any surface suitable for cyanoacrylate fuming. 2. Conduct a cyanoacrylate-based fuming under ±heated ambient air/cyanoacrylate, controlled atmosphere, and vacuum conditions. 3. Understand and perform the variety of chemical techniques used in conjunction with cyanoacrylate fuming. 4. Understand the chemical components and reactions of the different techniques and their applications. 5. Choose the appropriate technique for the existing environmental conditions. 6. Prepare appropriate solutions and mixtures. Expectations/Evaluation. 1. Proper documentation of all activities in your course notebook and worksheets/forms. 2. Familiarity with the chemistry, technique, and application of the following methods: ninhydrin, physical developer, powders, small particle reagent, cyanoacrylate ester, ardrox, rhodamine 6G, MBD, inherent luminescence, amido black, and Gentian violet. 3. Succesful completion of this module will be determined by a combination written/performance competency examination, which covers fuming development techniques, chemical development techniques, and laser and alternate light source development techniques. References. 1. Lee, HC and Gaensslen, RE, eds. Advances in Fingerprint Technology ; Elsevier Science, NY 1991. And references therein. 2. Pounds, CA and Jones, RJ (1983) Trends in Analytical Chemistry 2, 180-183.
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2 3. Onstwedder, J and Gamboe, TE (1989) Journal of Forensic Sciences 34, 321-327. 4.
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Chem427_latentprints_s08 - CHEM/FRNSC 427W Latent...

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