Transcription

A Simplified Guide ToTrace Evidence

beincludedinthediscussion.

Principles of Trace 0s[1].Sherwin- ‐Williams ulaExpress als/258/forensic- oryServices,Chemistry(http://www.fbi.gov/about- ‐us/lab/scientific- ‐analysis/chem)

sionavailable.Why and when is trace evidence aserstofindandcollecttraceevidence.

dexaminationmadeitpossible.

How It’s DoneEvidenceThatMaybeCollectedHair- irsamplesareprimarilycollectedusingtweezers.Fiber- lycollectioncrucialtopreventlossofmaterialorcross- tingthematerialsatthelaboratory.

ratelybaggedtopreventcross- tp://www.nfstc.org/download/65)Glass- ecanbevaluableindeterminingend- ollectedatahit- ‐and- etin#3.(http://www.nfstc.org/download/65)Paint- layeredcolors,lustersandtypesoftenmakepainthigh- onevehiclehitsanothervehicle,a

regionalornationalfacilities.Thetypeof

doneusinghigh- wearinaside- ‐by- metry,induction- ‐coupledmassspectrometry,X- lbiologicalevidence.(CourtesyofNFSTC)

originviaclasscharacteristicsandotherproperties.

LaboratoryAccreditationBoard(http://www.ascld- ‐lab.org/)andANSI- onsandthesupplementalexplanationoffindings.

TraceEvidenceConclusionScale(introducedin2009) Identified(TypeIAssociation)- samesource. VeryStrongSupport- hepopulationofthisevidencetype. StrongSupport(TypeIIAssociation)- lationofthisevidencetype. ModeratelyStrongSupport(TypeIIIAssociation)- idualsourcecannotbedetermined. ModerateSupport(TypeIVAssociation)- associativevalue. LimitedSupport(TypeVAssociation)- tion. Inconclusive- betweentheitems. Elimination- hatherassailantgrabbedherleftarmandstoleher

atmightbeimportanttothenon- estion,butnotautomotivepaintfromthecarinquestion.

.Common TermsBulksample- stics- es.FractureMatch(sometimescalledaPhysicalMatch)- sofajigsawpuzzle.Glass- lCharacteristics- .Microscopy- eSample- todocumentation.Probative- analysisevidence.

Pyrolysis- lectronmicroscope- athree- ‐dimensionalimageofthesurfaceoftheobject.Paint- endersandbinders.Primarytransfer- another.Radialfractures- e- l.Tracesample- antitativechemicalanalysis.Resources & gov/app/publications/abstract.aspx?ID (http://www.nij.gov/journals/258/forensic- istics.com/cert ovw.cfm),(accessedJuly31,2012)

/firearms/glossary.htm- July31,2012)LaboratoryPhysicalEvidenceB ULLETIN# n#3:“CollectionofGlassFragments(online),”andB ULLETIN# ad/65)(accessedJuly20,2012).Lyle,D.P.F ORENSICSFORD UMMIES tein,Richard.C RIMINALISTICS:A NINTRODUCTIONT OF ORENSICS CIENCE lletin:C ENSUSO FP UBLICLYF UNDEDF ORENSICC RIMEL ency

Forensic Evidence Admissibility andExpert ll- n1975,morethanahalf- eflexible.[1]293Fed.1013(1923)

ormofanopinionorotherwiseif:a. idenceortodetermineafactinissue;b. thetestimonyisbasedonsufficientfactsordata;c. hods;andd. mitted,thejudgeshouldconsider: ion?[2]The“DaubertTrilogy”ofcasesis:D AUBERTV .M ERRELLD OWP HARMACEUTICALS,G ENERALE LECTRICC O .V .JOINERandK UMHOT IREC O .V .C ARMICHAEL.

idencecouldbehandledthroughvigorouscross- lexevidenceortestinginaneasy- ‐to- vid.702.Itonlyallowsexperts“qualified ans,butmostincludein- headmissibilitydecisionislefttothejudge.

.C RIMINALISTICS:A NINTRODUCTIONT OF ORENSICS CIENCE nsicScienceTechnologyCenter,Inc.About This (BJA),award#2009- ‐D1- ‐BX- cScienceTechnologyCenter NFSTCScienceServingJustice 395- ‐[email protected]

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