Transcript Methods for Taking Fingerprints

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Visible prints are made when fingers touch a
surface after toughing a colored substance like
blood, ink, grease, paint, ect.
Plastic Prints
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Are made when ridge impressions are left in soft
surfaces like putty, wax, soap, dust, ect.
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On hard and non-absorbent surfaces
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Ex. tile, mirrors, painted wood
Developed with powder
On Porous surfaces
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Ex. Papers cardboard, and cloth
Devolved using chemicals
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RUVIS
Reflected Ultraviolet Imaging System
 Used to locate latent prints
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Powder
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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
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Super Glue fuming
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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
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Iodine Fuming
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Iodine crystals are heated and fumes
combine with print to make them
visible
 Not permanent, will fade quickly
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Ninhydrin
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Physical Developer
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Reacts with amino acids in prints to make a purple
blue color
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…
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Quartz halogen, xenon arc, indium arc
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Small Objects
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Transport entire object
Large objects
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Photograph first
 Allows print to be compared to digital database
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Then lift with tape and place on labeled cards
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Loop Count = 8
Body Part
Body Height
Outstretched reached of both
arms
Trunk height
Width of the head
Length of the head
Length of the right ear
Width of the right ear
Length of the left foot
Length of the left middle
finger
Length of the left little finger
Will West's
William West's
measurements in
measurements in
cm
cm
178.5
177.5
187
91.2
19.7
15.8
14.8
6.6
28.2
188
91.3
19.8
15.9
14.8
6.5
27.5
12.3
12.2
9.7
9.6