c) Iodine Fuming for porous surfaces. Your instructor or lab technician will demonstrate this technique. 4. Photograph any latent fingerprints that were developed prior to performing a tape-lift or any other technique that may alter or destroy the evidence. 5. Analyze the fingerprint(s) from the evidence for general classification and for different minutiae. If development of the fingerprint on the evidence cannot be achieved, see your laboratory instructor. 6. Compare the unknown evidence to the reference exemplars. Determine the fingerprints’ general classification to narrow down the suspect list. Next examine the minutiae to individualize the fingerprint. 7. After individualization has been achieved, answer the group questions. Make a conclusion to the identity of the fingerprint associated to your pieces of evidence and report your findings to the instructor using the attached report page. 8. Organize your group lab-report, by placing the page with the taped fingerprints of this exercise from all group members, answered group questions, chain of custody, and report page into one document and turn this lab-report in before you leave. At home: Incorporate the photographed unknown fingerprint(s) and known comparison fingerprint(s) into a single document. Using Microsoft Paint or similar a software program (ie. Adobe Photoshop), use the highlighting tools (ie. circles or squares) to highlight six minutiae points that are located in BOTH the unknown and the exemplar. Label the minutiae and classify the fingerprints in the software program (utilize the text box function to do this). Also, use the text box to include the unknown number and what piece of evidence the fingerprint was collected from. Print this document and incorporate it into your post lab question submission (question 5). Tape Unknown Prints Here
SCI 114 – Scientific Principles of Forensic Science Laboratory Exercise: Fingerprint Analysis Page 7 of 7 Group Critical Thinking Questions (15 Points) Answer the following questions and turn your work in as designated by the laboratory instructor. Include names of group members that participated in collaborative work. 1. Are fingerprints classified or individualized? Explain. 2. What were the classifications of each of your unknown fingerprints? 3. To whom were the unknown fingerprints individualized, and how did you determine this? Be specific. 4. Which techniques did you choose to develop each of your unknown fingerprints? Why did you choose each? 5. If the evidence is a partial fingerprint and cannot be classified, can you still make a fingerprint match to an individual? Post Laboratory Questions (25 Points) To be answered individually, typed, and turned in before next laboratory class as designated by your instructor. 1. If a loop opens to the right, is it an ulnar or radial loop? How did you come to your conclusion? 2. A burglar breaks into a house through the window, and steals jewelry from the bedroom drawers. What kinds of items can you try to develop any fingerprints off of that may have been left behind? 3. List two other fingerprint development techniques not used in class, and briefly describe them. 4. In what situations and from what types of objects from a crime scene might a fingerprint be “lifted”? Describe how to lift and preserve a fingerprint using adhesive tape. 5. Did you correctly identify all your unknowns? If not, for each incorrect identification, confirm mismatching minutiae points (described in step 9 of procedure). If all were correctly identified, attach a 6-point match for any one of the unknown fingerprints of your choosing and the matching exemplar.
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- Spring '14