Technology Transition Workshop| Brian Dalrymple Forensic Light Source Evolution ... ·...
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TechnologyTransition Workshop
The Forensic Light Source –History, Evolution,Extension & Acquisition
Technology Transition Workshop| Brian Dalrymple
TechnologyTransition Workshop
Latent Fingerprint Image Enhancement: The Forensic Light Source – History, Evolution, Extension & Acquisition 2
TechnologyTransition Workshop
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History
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Latent Fingerprint Image Enhancement: The Forensic Light Source – History, Evolution, Extension & Acquisition
Serendipity 1976Ninhydrin on black cardboardIodine?J.M. DuffIodine fluorescence in 1911Robert Olsen, Sr.Inherent fluorescence?
History
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E.R. Menzel – Argon ion laserTLC plates – fingerprint fluorescenceLaser safety gogglesInherent fluorescence on black tapeRevealed and photographed by laserIdentified as suspectFirst case in history• Laser application• Fluorescence as serious tool
History
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1977 – Argon Ion Laser
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1977 – Argon Ion Laser
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Laser Implications
No previous light exploitation UV fluorescent powder ineffectiveNew direction in fingerprint detection% absorption/reflectionNothing absorbs 100% of incident lightNothing reflects 100% of incident light Fixed dynamic rangeFingerprints – sub‐nanogramLimited detection sensitivity
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Luminescence
0% reflected incident lightLuminescence of fingerprintLuminescence of substrateMuch wider potential dynamic rangeMuch more sensitive
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1976 – Argon Laser
Fingerprints on skinFeasibility study – detection on skinFingerprint photographed on living skinDetected and photographed Immediately after deposition
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Fingerprints on SkinSuppositions
Body begins decay at deathFingerprint on skin extremely fragileVulnerable to:• Time• Temperature • HumidityNot feasible on living skinSmooth hairless skin
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Older manHigh heat, high humidityUntreated fingerprint on handShaking handsFingerprint classifiable Almost certainly contamination
Visitor to OPP Lab
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Argon Laser – 1977
80 fraud chequesExamined by laser4 impressions locatedOne identified as suspectTreated with ninhydrin60 impressions developedSeveral suspects identifiedNot the one revealed by laser
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Evolution
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Latent Fingerprint Image Enhancement: The Forensic Light Source – History, Evolution, Extension & Acquisition
Circa 1980
Introduction of YAG laserPortableDurable110 V532nm emissionPulse laserLow repetition rateDiscontinued
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1991 – 1992 Serial Killer
Suspect’s home discoveredHome examined by LumiliteTraces of ridge detail detected
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1991 – 1992 Serial Killer
Residence examined by argon laser40 untreated impressions located
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1990’s
Re‐introduction of YAG laserPortableDurable110 V532nm emissionMuch better pulse rateCoherent speckle
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Results – Laser Alone1977 – 1995
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Latent Fingerprint Image Enhancement: The Forensic Light Source – History, Evolution, Extension & Acquisition
Paper napkin found beside bodyOnly physical evidenceLaser examinationOne impression locatedIdentified as accusedNot detected by ninhydrin
Homicide
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Valerian Trifa – 1984
Subject accused of war crimesGerman archival documentsExamined by laserImpression on postcard• Identified as subject• Recipient Heinrich Himmler• Print 42 years old
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Fish Knife
Varnished wooden handleExamined by powder – negativeExamined by laser – impression foundIdentified as suspect
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Failed to detonateBlack electric tapeFingerprint detected by laserIdentified as accused
Improvised Explosive Device
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Alternatives
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Latent Fingerprint Image Enhancement: The Forensic Light Source – History, Evolution, Extension & Acquisition
1976 – 1979
No “alternatives” on horizonAll results inherent fluorescenceNo chemical extensionsMenzel – circa 1980 – CA/R6GCombo greater than the sum of partsSingle biggest advance of last 20 years
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Circa 1979 – 1980
Appearance of first laser “alternatives”• Lumilite (Canada)• Polilight® (Australia)• Omnichrome (US)Primarily for CA/R6GNo documented reporting of untreated fingerprint detection
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Polilight® PL‐500
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Polilight® PL‐500
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Alternate Light Sources
Much cheaper than lasersMuch safer than lasers for eyesCheaper to runAir‐cooledPortableRelatively low maintenance
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Circa 1985
Menzel – zinc chloride Post ninhydrin treatmentAlmog et al. – ninhydrin analogs 5 methylthion ninhydrin5 methoxi‐ninhydrin and othersAll with fluorescent properties
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Focus Now on DevelopingFluorescing Reagents
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Circa 1990
C.A. Pounds – DFOFluorescing fingerprint reagentExcited by argon laser or “ALS”Ninhydrin post‐DFO reveals more detail Perceived value of laser diminished
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Circa 2000
J. Almog, Israel Police ForceIndanedione Ninhydrin analogFluorescing fingerprint reagentExcited by argon laser or “ALS”
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Circa 2000
Introduction of LED lightsCheaperCool, efficientRobustVery portableSpectral output similar to lamps
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Circa 2006 – Semiconductor Laser
Introduction of Coherent® TracER™Optical pumped semiconductor laser110 V powerBattery option – 2 hours of cord‐free useCool, efficientRobustVery portableOutput wavelength can be engineeredCurrent version is 532nmNo coherent speckle
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Semiconductor Laser
OPSC – Optically Pumped SemiconductorLasing medium is semiconductor chipOutput wavelength can be engineeredCurrent version – 532nm
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Latent Fingerprint Image Enhancement: The Forensic Light Source – History, Evolution, Extension & Acquisition
Photographs courtesy of Coherent Inc.
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Photographs courtesy of Coherent Inc.
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Photographs courtesy of Coherent Inc.
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Pig Farm
Serial killerOver 25 victimsFarm examined by laser and FLSPalm print detected by FLSIdentified as victimNot detected by laser
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Filtered Lamps
1980 to presentLumilite – CanadaPolilight®OmnichromeSpex CrimeScope®
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Cheaper!Lighter!
More portable!More dependable!
No speckle!
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Questions?
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Contact Information
Brian Dalrymple
PO Box 296, Orillia ON L3V 6J6
Canada
Tel. 705‐835‐0227
Note: All images are courtesy of Brian Dalrymple unless otherwise noted.
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