classification of fingerprints
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/1.jpg)
Classification of
Fingerprints
![Page 2: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/2.jpg)
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.
![Page 3: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/3.jpg)
![Page 4: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/4.jpg)
AFIS Criminal courts
consider 12 points a “match” for prints
Known Print on File
Unknown Print
![Page 5: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/5.jpg)
Types of Prints1. Plastic (Molded) Print
3D print made as indentations in soft material
Examples : fresh paint, soap, candle wax
![Page 6: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/6.jpg)
Types of Prints2. Visible Print
left by a finger that has touched colored material
Examples: blood, paint, ink, grease, mud
![Page 7: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/7.jpg)
Types of Prints3. Latent Print
prints result from deposit of secretions from skin
invisible to the naked eye until developed
developed by chemical or physical means
![Page 8: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/8.jpg)
Visualizing Latent Prints
Powders used on hard, nonabsorbent surfaces adhere to both water and fatty deposits choose a color to contrast with the
background
![Page 9: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/9.jpg)
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
![Page 10: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/10.jpg)
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
![Page 11: Classification of Fingerprints](https://reader036.vdocuments.us/reader036/viewer/2022062302/5681666a550346895dda023d/html5/thumbnails/11.jpg)
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