Fingerprinting FRICTION RIDGE Fingerprints Palm Prints Barefoot Impressions

Fingerprinting

FRICTION RIDGE • Fingerprints • Palm Prints • Barefoot Impressions

FRICTION RIDGE IMPRESSIONS PATENT/VISABLE PLASTIC LATENT

PATENT/VISABLE PRINT Friction ridges that are stained with a foreign colored substance, such as blood, ink, paint, grease or dirt. This makes a visible impression that can be seen with the naked eye.

PLASTIC PRINT An indentation into a soft substrate such as chewing gum, wax, soap, putty, tar, butter or clay which leaves a three-dimensional impression. This makes a visible impression that can be seen with the naked eye.

IMPRESSION EVIDENCE • Formed when one object is pressed against another material. • Footprints • Tire Tracks • Bite Marks • Tool Marks.

CASTING

LATENT PRINT Fingerprint impressions secreted on a surface or object. Latent prints are usually invisible to the naked eye.

DEVELOPING FINGERPRINTS • Nonporous Surfaces • Glass • Marble • Metal • Plastic • Finished Wood • Light • Powder • Superglue Fuming • Porous Surfaces • Fabric • Paper • Un-Finished Wood • Iodine Fuming • Silver Nitrate • Ninhydrin

DUSTING FOR FINGERPRINTS • Select an appropriate powder and brush • Fan the brush • Dip fan tips in SMALL amount of powder • Fan off excess powder • Dust area with gentle strokes or light spinning of the brush

LIFTING THE PRINT • Use Clear Plastic Tape • Apply end of tape away from print and carefully smooth out over print • Lift the tape • Place tape on a backing card • Document necessary information on backing card

LABORATORY TESTING • Blood • Items to be tested for DNA • Known DNA samples • Firearms • Porous materials (paper, unfinished wood, cardboard, etc. )

WESTERN IDENTIFICATION NETWORK AUTOMATED FINGERPRINTING IDENTIFICATION SYSTEM WIN / AFIS

National Crime Information Center • Computerized Index of Documented Criminal Justice Information • Over 20 Files of Information • Available 24 hours a day 365 days a year

PRACTICAL EXERCISE

ROLLING FINGERPRINTS

ROLLING INKED PRINTS • Roll the finger on the ink so the entire pad is covered nail to nail • Thumb is rolled towards the subject’s body (1 st Digit rolled) • Fingers are rolled away from the subject’s body (Order - Index, Middle, Ring, Little finger) • Plain Impressions done last (4 fingers 1 st, then thumbs)

FINGERPRINT CARD

SPECIAL CIRCUMSTANCES • Deformed or Missing Fingers • Fully Amputated • Tip-Amputated • Extra Finger • Scarred Fingers • Worn Fingerprints

REASONS FOR REJECTION • Finger was not fully rolled • Allowing the fingers to slip or twist • Use of improper inks • Failure to clean the subject’s fingers • Failure to keep equipment clean • Use of too much or too little ink • Recording fingerprints impressions within the wrong

PRACTICAL EXERCISE

QUESTIONS