Extra Fingerprinting Information

Here are just a few extra notes on fingerprints.

-Fingerprinting procedures use of digitized, electronic reproduction systems.
-10 Print card, is a card for recording fingerprints and other personal data and then filed for future reference.
-Fingerprint Kits are prints taken from crime scene used to match up with prints from those of suspects. Usually issued to every patrol officer. Contains basic black and white powders.
-Fingerprint impressions are:
1. Latent Print
2. Plastic Print (3-D, dirt, mud, blood, etc.)
3. Visible Print
4. Invisible Print

-Methods of Developing Invisible Prints
1. Powders
2. Fuming
3. Lifting Prints
4. Chemicals

-Powders come in:
1. Black
2. White
3. Colors

-Lifting Prints
*Lift with piece of tape
*Lifters, black, white and clear
*Tape pressed on print
*Lifted to card or form
*Always take note of time, place and date.

-Fuming
*Invisible prints are made visible by cyanoacrylate capors, a chemical reaction. AKA super glue.
*Other chemicals use for this are:
1. Iodine-uses cold or warmed crystals of iodine. Works best on latent prints of fat or oil. Creates yellow/brown umpression. Can be used for paper, wood, metal and skin.
2. Ninhydrin-Suspended in ethyl alcohol or acetone. Sprayed or brushed on item, allowed to air dry. Purple/red stain on ridge pattern. Best if used on porous materials, paper, fabric and older prints.
3. Silver Nitrate-Let dry and exposed to light. Develops as brown outline. Uses on paper, unpainted wood, porous materials.
4. Chem print

-Chemical Processing Table:
1. Process
2. Reaction
3. Colors

-Fingerprints as Evidence:
*Admissible in most courts.
*No 2 Fingerprints are alike.
*Systematic comparisons