Fundamentals of Fingerprinting

1
Fundamentals of Fingerprinting

• Knowledge of proper techniques.
• Awareness of good quality fingerprints, which
  include clarity and pattern recognition.
• Practice.

2
Preparation

• Prior to recording an individuals fingerprints
  on a LiveScan Unit , the operator should take a
  couple of minutes and perform a few pre-printing
  operations.

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Preparation

• The individual being fingerprinted should stand
  directly in front of the LiveScan unit,
  approximately a forearms length away.
• The printing surface of the platen should be from
  39 to 42 inches from the floor.
• In most cases the individual should stand to
  the right of the operator. This will
  enable the operator to control the individuals
  movement. (DEMO)

4
Preparation

• The operator should not allow the person to
  help while taking the fingerprints.
• The persons fingers should be held with both
  hands. One hand should hold the tip of their
  finger, while the other hand holds the middle
  joint of their finger. ( DEMO)

5
Preparation

• If the image appears to be too dark, check for
  perspiration or try using less pressure.
• If the image appears to be too light, increase
  the pressure slightly, or try using the
  Optimize/Contrast tab.
• If the image is still too light, use a PreScan
  block. (DEMO)

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Recording the Images

• The operator will record the fingerprints in the
  following manner
• Slaps or Plain impressions
• Right Thumb
• Right Four fingers
• Left Thumb
• Left Four Fingers

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Recording the Slaps

• Place the Right Thumb on the Platen (DEMO)

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Recording the Slaps

• The slaps or plain impressions should be taken as
  straight up and down as possible. (DEMO)

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Recording the Slaps

• When recording the slaps, the operator should
  avoid cutting off the tops of the fingers.
• Ideally, you should see the impressions and the
  first crease. (DEMO)

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Recording the Slaps

• The impressions SHOULD NOT look like
  this (DEMO)

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Recording the Slaps

• If the individual has large hands it may be
  necessary to angle the fingers SLIGHTLY to fit
  them in the box
• The angle SHOULD NOT be more than 30 degrees.
• If the angle is too severe, this may cause false
  sequencing errors.

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Recording the Slaps

• Avoid severe angles (DEMO)

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T.I.F.O.

• Remember the acronym T.I.F.O.
• Thumbs In
• Fingers Out

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Fingerprinting Techniques

• The Thumbs of the person being fingerprinted
  should be rolled In towards their body
• The Fingers should be rolled Out or away from
  their body.
• This movement allows the fingers to be rolled
  from an awkward position to a comfortable
  position.

15
Recording Rolled ImpressionsPosition Finger on
Cross Hair
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Recording the Rolled Impressions

• After centering, rock the finger backward either
  right or left until the outer edge of the finger
  is visible.
• (DEMO)

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Recording Rolled ImpressionsRock Back on Finger
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Recording the Rolled Impressions

• Step on the foot pedal, when you hear the beep,
  begin to roll the finger on the platen.
• Continue rolling until you reach the opposite
  side of the finger.

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Recording the Rolled Impressions

• When the roll is completed, roll the finger
  backwards slightly. This will stop the camera.
• This is the Rock and Roll method.
• Roll the remaining fingers in this manner.

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Recording the Rolled Impressions

• When rolling the fingers, the finger should be
  rolled completely from one side to the other.
• This technique is called Nail to Nail.
• Another acronym to remember is N2N

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Recording the Rolled Impressions

• Another acronym to remember is N2N Nail to Nail.
• When rolling the fingers, the finger should be
  rolled completely from one side to the other.

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Fundamentals of Fingerprinting

• Knowledge of proper techniques.
• Awareness of good quality fingerprints, which
  include clarity and pattern recognition.
• Practice.

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Recording Rolled Impressions

• After the finger has been rolled, the operator
  should be able to recognize the fingerprint
  pattern.

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LAW Loops Arches Whorls
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Awareness Square Edges

• Rock And Roll, T.I.F.O., N2N

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Awareness Finger Placement

• Rock Roll, T.I.F.O., N2N

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Awareness Niblet

• Rock Roll, T.I.F.O., N2N

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Awareness Slippage

• Rock Roll, T.I.F.O., N2N

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Awareness Dalmation Effect

• Rock Roll, T.I.F.O., N2N

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Fundamentals of Fingerprinting

• Knowledge of proper techniques.
• Awareness of good quality fingerprints, which
  include clarity and pattern recognition.
• Practice.

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Thank You!