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Criminal Criminal InvestigationInvestigation
CJUS 201CJUS 201
FingerprintsFingerprintsPart 12Part 12
FingerprintsFingerprints1.1. Friction ridge skinFriction ridge skin
- hands: fingers, palms- hands: fingers, palms- feet: toes, soles, heels- feet: toes, soles, heels
a. a. Side opposite fingernailSide opposite fingernail: “: “bulb”bulb” - friction ridge outlines- friction ridge outlines
b. b. Two layers of skinTwo layers of skin - inner / outer- inner / outer
(1) (1) EpidermisEpidermis
Prints, contPrints, cont..- contains ridges- contains ridges- 2 mm thick- 2 mm thick
(2) (2) DermisDermis- - demal papillardemal papillar- origination- origination- scars / disease- scars / disease
c. c. UsesUses
(1) (1) Friction ridgesFriction ridges
Prints, cont.Prints, cont.- leaves impression- leaves impression
- body secretions- body secretions
- material touched- material touched
(2) (2) IdentificationIdentification
- permanent / individual- permanent / individual
- form on fetus- form on fetus
(3) (3) Hands / feet means to IDHands / feet means to ID
- fingers routinely used- fingers routinely used
Prints, contPrints, cont..2.2. PrintsPrints
- exact impression / image- exact impression / image
a. a. Most common meansMost common means - perspiration - perspiration - 99% water- 99% water
(1) (1) Oils / chemicalsOils / chemicals - 1% amino acids / salts- 1% amino acids / salts
(2) (2) Outside contaminantsOutside contaminants
Prints, contPrints, cont..b. b. Types of surfaceTypes of surface
(1) (1) NonporousNonporous - most productive- most productive
(2) (2) PorousPorous
- chemical treatment- chemical treatment
(3) (3) PlasticPlastic - photograph- photograph
- cannot be developed- cannot be developed
Prints, contPrints, cont..c. c. ImpressionImpression
- friction ridges - friction ridges
- inside of fingers- inside of fingers
(1) (1) TransferredTransferred
- deposit of perspiration- deposit of perspiration
(2) (2) DuplicatedDuplicated
- by this- by this
- other substances- other substances
Prints, contPrints, cont..3.3. Files maintainedFiles maintained
- sole purpose- sole purpose
a. a. ArrestArrest - WASIC- WASIC - NCIC - NCIC
b. b. State requirementsState requirements - employment- employment - driver’s license- driver’s license - certificates- certificates
Prints, contPrints, cont..c. c. Professional licenseProfessional license - health care- health care - construction- construction - accounting- accounting - education- education
d. d. Military serviceMilitary service - enlisted / civilian- enlisted / civilian
4.4. Types of printsTypes of prints- visible / latent / plastic- visible / latent / plastic
Types, contTypes, cont..a. a. Latent printsLatent prints - law enforcement- law enforcement - crime scene- crime scene
(1) (1) ProcessProcess- detecting / raising / lifting- detecting / raising / lifting
(2) (2) TermTerm- invisible - invisible - fingertips- fingertips
- secretions / contaminants- secretions / contaminants
Types, contTypes, cont..b. b. Two sources of materialsTwo sources of materials
- natural / environmental- natural / environmental
(1) (1) NaturalNatural
- perspiration- perspiration
- body residue (acids / fats / - body residue (acids / fats / salts)salts)
(2) (2) EnvironmentalEnvironmental
- foreign matter- foreign matter
- dust / soot / pollen / cooking - dust / soot / pollen / cooking oilsoils
Types, contTypes, cont..c. c. Personal factorsPersonal factors
- print left or not- print left or not
(1) (1) PhysiologyPhysiology
- perspire?- perspire?
(2) (2) Surface typeSurface type
- suitable - suitable
- unpainted wood / paper / textured- unpainted wood / paper / textured
- glass / enamel / metal / glossy- glass / enamel / metal / glossy
Types, contTypes, cont.. (3) (3) PressurePressure
- firm / not heavy- firm / not heavy- ridges light- ridges light- distort detail- distort detail
5.5. Fingerprint classificationFingerprint classification- three primary patterns (types)- three primary patterns (types)
a. a. ArchArch - ridges enter one side- ridges enter one side - rise / curve in center- rise / curve in center
Classification, contClassification, cont.. - flow out opposite side- flow out opposite side
(1) (1) Plain / tintedPlain / tinted
(2) (2) 5% – 10%5% – 10%
b. b. LoopLoop - enter on either side- enter on either side - make loop- make loop - flow out opposite side- flow out opposite side - same side- same side
Classification, contClassification, cont.. (1) (1) Plain / double loop / central Plain / double loop / central
pocket loop / pocket loop / accidentalaccidental
(2) (2) 60% - 65%60% - 65%
c. c. WhorlWhorl - enter on both sides- enter on both sides - form circle- form circle - flow out opposite side- flow out opposite side
(1) (1) 25% - 30%25% - 30%
Classification, contClassification, cont..6.6. Fingerprint patternsFingerprint patterns
- used to classify- used to classify- not individualize- not individualize
a. a. Counted: core to deltaCounted: core to delta - points of distinction- points of distinction - necessary for ID- necessary for ID
(1) (1) FranceFrance = 17 = 17
(2) (2) EnglandEngland = 16 = 16
Patterns, contPatterns, cont.. (3) (3) SpainSpain = 10 to 12 = 10 to 12
(4) (4) United StatesUnited States = 12 = 12
(5) (5) Washington StateWashington State = 12 = 12
b. b. Evidentiary valueEvidentiary value
- crime scene- crime scene
- victim- victim
- person identified- person identified
Patterns, contPatterns, cont..7.7. Methods of classifyingMethods of classifying
- mathematical formula- mathematical formula- shapes / position / size- shapes / position / size
a. a. CharacteristicsCharacteristics - unique properties in ridge detail- unique properties in ridge detail - different from each other- different from each other - different from one another- different from one another
b. b. TypesTypes - ending ridge- ending ridge
Methods, contMethods, cont.. - bifurcation- bifurcation - dot- dot - short ridge- short ridge - island (enclosure)- island (enclosure)
c. c. FBI: catalog of printsFBI: catalog of prints - NCIC- NCIC
(1) (1) Taken in USTaken in US
(2) V(2) Vary: state to stateary: state to state
Methods, contMethods, cont..d. d. Collection: two purposesCollection: two purposes
- evidence of patterns- evidence of patterns
- positive identification- positive identification
8.8. Lifting of fingerprintsLifting of fingerprints
a. a. DustingDusting
- specific steps- specific steps
(1) (1) Brush is cleanBrush is clean
Lifting, contLifting, cont.. - roll handle- roll handle
(2) (2) Shake powderShake powder- loosen- loosen
(3) (3) Apply lightlyApply lightly- follow contour lines- follow contour lines
(4) (4) Remove excessRemove excess
(5) (5) PhotographPhotograph
Lifting, cont.Lifting, cont.
b. b. LiftingLifting
- commercial lift card- commercial lift card
(1) (1) White / black backgroundWhite / black background
- color of powder- color of powder
- rubber lifter- rubber lifter
(2) (2) Transparent tapeTransparent tape
- different sizes- different sizes
- palm size- palm size
Lifting, contLifting, cont..c. c. Transfer to cardTransfer to card
- identification- identification
9.9. Chemical developmentChemical development- paper / cardboard / unpainted wood- paper / cardboard / unpainted wood
a. a. Iodine methodIodine method - crystal fumes- crystal fumes - absorbed by oils- absorbed by oils - yellowish/brown print (fade)- yellowish/brown print (fade) - will fade / photograph immediately- will fade / photograph immediately
Development, contDevelopment, cont..b. b. NinhydrinNinhydrin - organic chemical- organic chemical - amino acids / protein- amino acids / protein
(1) (1) Kept 2 hoursKept 2 hours: room : room temperaturetemperature
- 1 to 3 days to fully develop - 1 to 3 days to fully develop
(2) (2) Purple-colored printPurple-colored print- photograph immediately- photograph immediately
c. c. Silver nitrateSilver nitrate
Development, contDevelopment, cont.. - sodium chloride- sodium chloride - perspiration- perspiration - organic material- organic material
(1) (1) Reddish-brownReddish-brown- disappear 2 hours- disappear 2 hours
(2) (2) Ultra-violet lightUltra-violet light- photograph immediately- photograph immediately
d. d. Cyanoacrylate fumingCyanoacrylate fuming
Development, cont.Development, cont.
- esters / resins- esters / resins - “- “super gluesuper glue””
(1) (1) Fuming chambersFuming chambers- vehicles- vehicles- pads opened / placed- pads opened / placed
(2) (2) Non-porous surfacesNon-porous surfaces- photographed- photographed- dusted- dusted- alter other biological - alter other biological
evidenceevidence
Development, contDevelopment, cont..e. e. RadiationRadiation
- raises prints- raises prints
(1) (1) Ultraviolet raysUltraviolet rays
- shows prints- shows prints
- dusted- dusted
(2) (2) LaserLaser
- vitamins in perspiration- vitamins in perspiration
- skin / paper products- skin / paper products
Fingerprint SystemsFingerprint Systems1.1. AFISAFIS
- Automated Fingerprint Identification - Automated Fingerprint Identification Sys.Sys.
a. a. TechniciansTechnicians
- digitize information- digitize information
- inkless prints- inkless prints
- scanned- scanned
- electronic image- electronic image
- stored in data base- stored in data base
- access: NCIS / WASIC- access: NCIS / WASIC
Systems, contSystems, cont..b. b. Suspect printSuspect print
- classified (arch / loop / whorl / - classified (arch / loop / whorl / etc.)etc.)
- 12 matching characteristics- 12 matching characteristics
- data base computer- data base computer
(1) (1) Produce comparisonsProduce comparisons
- several matches- several matches
- technician examines- technician examines
(2) (2) Scan 1 million in 4.5 minutesScan 1 million in 4.5 minutes
Systems, contSystems, cont..2.2. Assessing surfaceAssessing surface
- three types- three types
a. Non-Porousa. Non-Porous - glass / plastic / polished metal- glass / plastic / polished metal - finished wood / processes paper- finished wood / processes paper
(1) (1) TexturedTextured- photograph- photograph
(2) (2) SmoothSmooth
Surface, contSurface, cont.. (3) (3) CurvatureCurvature
b. b. PorousPorous
- paper / wood / some painted - paper / wood / some painted surfacessurfaces
(1) (1) ChemicalChemical
- photograph- photograph
(2) (2) FluoresceFluoresce
- photograph- photograph
Surface, contSurface, cont..c. c. PlasticPlastic - putty / plastics / adhesives- putty / plastics / adhesives - paint (semi-hardened) / plaster- paint (semi-hardened) / plaster
(1) (1) PhotographPhotograph
3.3. Rolling printsRolling prints- from ‘V’ outward- from ‘V’ outward
a. Right handa. Right hand - thumb = 1- thumb = 1
Rolling, contRolling, cont.. - index = 2- index = 2 - middle = 3- middle = 3 - ring = 4- ring = 4 - little = 5- little = 5
b. b. Left handLeft hand - thumb = 6- thumb = 6 - index = 7- index = 7 - middle = 8- middle = 8 - ring = 9- ring = 9 - little = 10- little = 10