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Classification of Fingerprints

Classification of Fingerprints. AFIS. Automated Fingerprint Identification System Fingers are scanned to a screen where they can be enhanced and identified . In 2007 the FBI had more than 55 million digital fingerprints of known criminals. AFIS.

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Classification of Fingerprints

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  1. Classification of Fingerprints

  2. AFIS • Automated Fingerprint Identification System • Fingers are scanned to a screen where they can be enhanced and identified. • In 2007 the FBI had more than 55 million digital fingerprints of known criminals.

  3. AFIS • Criminal courts consider 12 points a “match” for prints Known Print on File Unknown Print

  4. Types of Prints • Plastic (Molded) Print • 3D print made as indentations in soft material • Examples : fresh paint, soap, candle wax

  5. Types of Prints • Visible Print • left by a finger that has touched colored material • Examples: blood, paint, ink, grease, mud

  6. Types of Prints • Latent Print • prints result from deposit of secretions from skin • invisible to the naked eye until developed • developed by chemical or physical means

  7. Visualizing Latent Prints Powders • used on hard, nonabsorbent surfaces • adhere to both water and fatty deposits • choose a color to contrast with the background

  8. Visualizing Latent Prints Iodine • fumes react with oils and fats to produce a temporary yellow-brown color • works best developing fingerprints on paper or cardboard

  9. Visualizing Latent Prints Ninhydrin • fumes reacts with amino acids to produce a purple color • works best developing fingerprints on porous surfaces such as paper, wood, cardboard

  10. Visualizing Latent Prints Cyanoacrylate • “superglue” fumes react with water and other fingerprint constituents to form a hard, whitish deposit. • works best on developing fingerprints on hard nonporous surfaces such as metals, glass, and plastic

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