Methods for Taking Fingerprints

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Presentation transcript:

Methods for Taking Fingerprints

Review: https://learninglab.si.edu/resources/view/196612 Intro: https://learninglab.si.edu/resources/view/633923

Visible Prints Visible prints are made when fingers touch a surface after touching a colored substance like blood, ink, grease, paint, ect. Plastic Prints Are made when ridge impressions are left in soft surfaces like putty, wax, soap, dust, ect.

Latent Prints On hard and non-absorbent surfaces On Porous surfaces Ex. tile, mirrors, painted wood Developed with powder On Porous surfaces Ex. Papers cardboard, and cloth Devolved using chemicals

Latent print developing techniques RUVIS Reflected Ultraviolet Imaging System Used to locate latent prints Powder Used once prints are located Comes in several colors, magnetic and non magnetic Adheres to perspiration and oils in print Can be photographed or collected with tape https://learninglab.si.edu/resources/view/643343

Latent print developing techniques Super Glue fuming Used on nonporous surfaces Ex metals, electrical tape, leather and plastic Fumes of super glue adhere to proteins in print and make a white visible print Made of 99% cyanoacrylate ester, which is what makes the prints visible Can be done in a fuming chamber or with a handheld wand Iodine Fuming Iodine crystals are heated and fumes combine with print to make them visible Not permanent, will fade quickly

Latent print developing technique Ninhydrin Reacts with amino acids in prints to make a purple blue color Physical Developer Is a silver nitrate based reagent Used when other techniques fail Other chemicals used include those that cause the print to fluoresce under a laser or high intensity light source such as… Quartz halogen, xenon arc, indium arc

Transporting prints Small Objects Large objects Transport entire object Large objects Photograph first Allows print to be compared to digital database Then lift with tape and place on labeled cards

Classifying prints

Pattern Prevalence

What Your Whorls could mean https://learninglab.si.edu/resources/view/2839359

One more identification technique Loop Count