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Unit 3: Fingerprints ( part 3)

Unit 3: Fingerprints ( part 3). III. Fingerprints as Evidence. A. Properties that make a fingerprint useful for identification = 1. its unique, characteristic ridges 2.its consistency over a person’s lifetime, 3. the systematic classification used for fingerprints (Henry Number).

raymond-sheppard
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Unit 3: Fingerprints ( part 3)

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  1. Unit 3: Fingerprints (part 3)

  2. III. Fingerprints as Evidence A. Properties that make a fingerprint useful for identification = 1. its unique, characteristic ridges 2.its consistency over a person’s lifetime, 3. the systematic classification used for fingerprints (Henry Number)

  3. B. No legal requirements in US on # of points/ minutiae that must match before certain it belongs to individual --criminal courts generally accept 12 points

  4. C. Computer-Based fingerprint files 1. AFIS = Automated Fingerprint Identification System a. started in the 60s b. by 80s at least 5 systems in use c. problem???? d. recently IAFIS available (Integrated) AFIS) . . . includes FBI criminal database of known fingerprint cards

  5. C. Computer-Based fingerprint files (cont.) 2. Other electronic databases for law enforcement a. CODIS = Combined DNA Indexing System b. IBIS = Integrated Ballistics Identification System DNA Fingerprint Ballistics Data

  6. C. Computer-Based fingerprint files (cont.) 3. Each electronic database has . . . a. “knowns” file b. “forensic” file = images or profiles from unsolved cases AND

  7. D. Types of Evidentiary Fingerprints 1. Patent = clearly recognizable Ex. Made with grease, dirt, oil, blood, etc. 2. Plastic = recognizable indentation in a soft receiving surface such as butter, silly putty, or tar 3. Latent = not visible, requires further processing for comparison

  8. Henry Number Activity

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