purpose of collection and examination aids in solution of case aids in solution of case develop...
TRANSCRIPT
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PURPOSE OF COLLECTION PURPOSE OF COLLECTION AND EXAMINATION AND EXAMINATION
Aids in solution of caseAids in solution of case Develop MO’s or show similar MO’sDevelop MO’s or show similar MO’s Develop or identify suspectsDevelop or identify suspects Prove or disprove alibiProve or disprove alibi Connect or eliminate suspectsConnect or eliminate suspects Identify loot and/or contrabandIdentify loot and/or contraband Provide leadsProvide leads
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PURPOSEPURPOSE
Prove an element of the offenceProve an element of the offence Building material on suspects clothing Building material on suspects clothing
may prove entrymay prove entry Bullets, residue at fire, semen, blood, Bullets, residue at fire, semen, blood,
tool marks, may all prove elements of tool marks, may all prove elements of certain offensescertain offenses
Safe insulation on tools may prove Safe insulation on tools may prove possession of burglary toolspossession of burglary tools
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PURPOSEPURPOSE
Prove a theory of a caseProve a theory of a case Footprints in soil may show how many Footprints in soil may show how many
were at scenewere at scene Auto paint on clothing may show that Auto paint on clothing may show that
person was hit by car instead of injured person was hit by car instead of injured otherwiseotherwise
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COLLECTION RULESCOLLECTION RULES
ONE PERSON COLLECTONE PERSON COLLECT PREVENT CONTAMINATIONPREVENT CONTAMINATION PHOTOGRAPH PRIOR TO REMOVALPHOTOGRAPH PRIOR TO REMOVAL MARK CRIME SCENE SKETCHMARK CRIME SCENE SKETCH RECORD IN NOTEBOOKRECORD IN NOTEBOOK PROCESS EACH ITEMPROCESS EACH ITEM BE THOROUGH – DO NOT HURRYBE THOROUGH – DO NOT HURRY
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FUNDAMENTALS OF FUNDAMENTALS OF EVIDENCE COLLECTIONEVIDENCE COLLECTION
PREVENT CONTAMINATIONPREVENT CONTAMINATION PROVIDE ADEQUATE SAMPLES AND PROVIDE ADEQUATE SAMPLES AND
STANDARDSSTANDARDS LABEL EACH ITEMLABEL EACH ITEM KEEP ITEMS SEPARATEKEEP ITEMS SEPARATE SEAL EACH CONTAINERSEAL EACH CONTAINER
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PROCEDURES FOR PROCEDURES FOR COLLECTING EVIDENCECOLLECTING EVIDENCE
EVIDENCE FOUNDEVIDENCE FOUND SEARCH STOPSSEARCH STOPS CRIME SCENE OFFICER MOVES TO AREACRIME SCENE OFFICER MOVES TO AREA DETERMINE IF EVIDENCE TO BE USEDDETERMINE IF EVIDENCE TO BE USED EVIDENCE MAN CALLEDEVIDENCE MAN CALLED PHOTOGRAPHPHOTOGRAPH SKETCHSKETCH DUST (IF REQUIREDDUST (IF REQUIRED PACKAGE AND IDENTIFYPACKAGE AND IDENTIFY PLACE IN COLLECTION AREAPLACE IN COLLECTION AREA
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COLLECTIONCOLLECTION
Obtain evidence legallyObtain evidence legally
WarrantWarrant
ConsentConsent
Incident to arrestIncident to arrest
exigent circumstancesexigent circumstances
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COLLECTIONCOLLECTION
Describe it in notesDescribe it in notes Location, circumstances, how obtainedLocation, circumstances, how obtained DateDate Chain of custodyChain of custody How identifiedHow identified
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COLLECTIONCOLLECTION
Identify it properlyIdentify it properly Case numberCase number Item numberItem number InitialsInitials DateDate Preferably on evidencePreferably on evidence If not on evidence on sealed containerIf not on evidence on sealed container
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COLLECTIONCOLLECTION
Package it properlyPackage it properly Use suitable containersUse suitable containers Seal against leakageSeal against leakage Package each item separatelyPackage each item separately If wet air dry before packaging (except If wet air dry before packaging (except
arson cases)arson cases)
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COLLECTIONCOLLECTION
Maintain chain of custodyMaintain chain of custody Same person that recovered should Same person that recovered should
initial, seal and send if possibleinitial, seal and send if possible Maintain in locked storage until sentMaintain in locked storage until sent Use personal delivery or some method Use personal delivery or some method
of shipment that has return receiptof shipment that has return receipt
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COLLECTION METHODSCOLLECTION METHODS
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VISUAL INSPECTION AND VISUAL INSPECTION AND COLLECTIONCOLLECTION
EXAMINE CONTACT SITESEXAMINE CONTACT SITES FORMULATE HYPOTHETICAL FORMULATE HYPOTHETICAL
RECONSTRUCTIONRECONSTRUCTION IF LOCATEDIF LOCATED
-DOCUMENT-DOCUMENT -PACKAGE-PACKAGE -TRANSPORT-TRANSPORT
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TAPE LIFTSTAPE LIFTS
USE PRESSURE SENSITIVE OR USE PRESSURE SENSITIVE OR “STICKY” TAPE FOR TRACE EVIDENCE“STICKY” TAPE FOR TRACE EVIDENCE
USE IN CONJUNCTION WITH OTHER USE IN CONJUNCTION WITH OTHER TECHNIQUESTECHNIQUES
USEFUL WHENUSEFUL WHEN VISIBLE EVIDENCE REMOVEDVISIBLE EVIDENCE REMOVED TO COLLECT MICROSCOPIC EVIDENCETO COLLECT MICROSCOPIC EVIDENCE
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PACKAGING AND PACKAGING AND SUBMISSION WITHOUT SUBMISSION WITHOUT
SAMPLINGSAMPLING IF UNSURE OR INEXPERIENCEDIF UNSURE OR INEXPERIENCED NO OBVIOUS TRACENO OBVIOUS TRACE SUBMIT WITHOUT REMOVING TRACESUBMIT WITHOUT REMOVING TRACE TRANSFERS CAN RESULT FROM TRANSFERS CAN RESULT FROM
HANDLINGHANDLING
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VACUUMINGVACUUMING
POORLY UNDERSTOOD – POORLY UNDERSTOOD – IMPROPERLY USEDIMPROPERLY USED
CAN BE VALUABLECAN BE VALUABLE SELECTIVELY AND KNOWLEDGEABLYSELECTIVELY AND KNOWLEDGEABLY PROPER ADAPTIONPROPER ADAPTION
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EVIDENCE FROM AUTOPSYEVIDENCE FROM AUTOPSY
Victim’s clothingVictim’s clothing Fingernail scrapingFingernail scraping Known hairKnown hair Known bloodKnown blood Swabs (sex related)Swabs (sex related) ProjectilesProjectiles Other traceOther trace
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PACKAGING EVIDENCEPACKAGING EVIDENCE
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PACKAGINGPACKAGING
Evidence must be handled in way Evidence must be handled in way that will prevent detrimental changethat will prevent detrimental change
Improper packaging can causeImproper packaging can cause ContaminationContamination BreakageBreakage EvaporationEvaporation Loss Loss
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PACKAGINGPACKAGING
Guidelines for handling different Guidelines for handling different types of evidence are provided by types of evidence are provided by many agencies.many agencies.
We will talk about how to package We will talk about how to package individual evidence as we discuss individual evidence as we discuss that type of evidencethat type of evidence
Evidence guide in Appendix I of Evidence guide in Appendix I of textbooktextbook
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PACKAGING PROBLEMSPACKAGING PROBLEMS
CONATINER SELECTIONCONATINER SELECTION IMPROPER PROTECTIONIMPROPER PROTECTION
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CONTAINER SELECTIONCONTAINER SELECTION
Arson evidence in open containerArson evidence in open container Paint samples loose in standard Paint samples loose in standard
envelopeenvelope Biological materials in contaminated Biological materials in contaminated
containercontainer Bullets placed in envelope and Bullets placed in envelope and
placed under heavy itemplaced under heavy item
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Improper protectionImproper protection
Piece of glass with bullet hole placed Piece of glass with bullet hole placed in trunk of car unprotectedin trunk of car unprotected
Soil samples in unsealed manila Soil samples in unsealed manila envelopeenvelope
Fluid samples in stoppered bottle Fluid samples in stoppered bottle placed in hot areaplaced in hot area
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GENERAL PACKAGING GENERAL PACKAGING
LIQUIDSLIQUIDS Placed in all glass sterile bottles or Placed in all glass sterile bottles or
containers and sealed with suitable tapecontainers and sealed with suitable tape Oils, gas, and explosives should be Oils, gas, and explosives should be
placed in unbreakable metal or plastic placed in unbreakable metal or plastic containers of sufficient strength to containers of sufficient strength to prevent ruptureprevent rupture
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GENERAL PACKAGINGGENERAL PACKAGING
FRAGILE ITEMSFRAGILE ITEMS Items susceptible to breaking, marring, Items susceptible to breaking, marring,
or other destructive change should be or other destructive change should be packed in tissue firstpacked in tissue first
Containers for fragile items should be Containers for fragile items should be selected to provide maximum protectionselected to provide maximum protection
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PACKAGING RULESPACKAGING RULES
Prevent contaminationPrevent contamination Package items separatelyPackage items separately
Prevent BreakagePrevent Breakage Wrap fragile items in tissueWrap fragile items in tissue
Prevent lossPrevent loss Seal containers properlySeal containers properly
Prevent misplacementPrevent misplacement Wrap smaller items before placing in envelopesWrap smaller items before placing in envelopes
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GENERAL PACKAGINGGENERAL PACKAGING
SMALL TRACE ITEMSSMALL TRACE ITEMS Should be placed in white paper using Should be placed in white paper using
the evidence fold before placing in the evidence fold before placing in container and sealedcontainer and sealed
Items used to retrieve samples should Items used to retrieve samples should be placed in separate piece of paper and be placed in separate piece of paper and sealed in same envelopesealed in same envelope
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STANDARD/REFERENCE STANDARD/REFERENCE SAMPLESSAMPLES
Physical evidence whose origin is Physical evidence whose origin is knownknown
Often required for comparison with Often required for comparison with samples from scene samples from scene
ExamplesExamples Hit and run – Known paint samples Hit and run – Known paint samples DNA evidence Buccal swabsDNA evidence Buccal swabs
Swabs from inside mouthSwabs from inside mouth
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STANDARD/REFERENCESTANDARD/REFERENCE
Substrate controlsSubstrate controls Uncontaminated surface material close Uncontaminated surface material close
to an area where physical evidence has to an area where physical evidence has been depositedbeen deposited
ExampleExample Arson – material believed exposed to Arson – material believed exposed to
accelerant and material believed not accelerant and material believed not exposedexposed
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SUBMITTING EVIDENCESUBMITTING EVIDENCE
Methods of deliveryMethods of delivery Personal deliveryPersonal delivery MailMail UPSUPS
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SUBMITTING EVIDENCESUBMITTING EVIDENCE
Personal deliveryPersonal delivery Someone familiar with caseSomeone familiar with case May be asked questionsMay be asked questions Evidence submission formEvidence submission form
DescriptionDescription HistoryHistory AdministrativeAdministrative requestsrequests
Chain of custody formChain of custody form
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SUBMITTING/EVIDENCESUBMITTING/EVIDENCE
Mail – UPSMail – UPS
Postal regulationsPostal regulations
Care in packingCare in packing
Certified – Return receiptCertified – Return receipt
Each item packaged separatelyEach item packaged separately
each item assigned numbereach item assigned number
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SAFETYSAFETY
Spread of AIDS and HepatitisSpread of AIDS and Hepatitis Normally transmitted through body Normally transmitted through body
fluidsfluids Body fluids present at many scenesBody fluids present at many scenes Caution and protection used at all Caution and protection used at all
timestimes Inoculation available for hepatitis B Inoculation available for hepatitis B
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SAFETYSAFETY
IAI GUIDELINESIAI GUIDELINES Wear minimum of latex gloves and tyvek Wear minimum of latex gloves and tyvek
shoe covers – large contamination – wear shoe covers – large contamination – wear tyvek suitstyvek suits
Use mask when dust or mist may be Use mask when dust or mist may be presentpresent
Sharp items in proper container and Sharp items in proper container and labeledlabeled
Red biohazard bag for disposal of Red biohazard bag for disposal of contaminated itemscontaminated items
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SAFETYSAFETY
IAI GUIDELINESIAI GUIDELINES Note taking with uncontaminated glovesNote taking with uncontaminated gloves Protective clothing soiled or torn removed Protective clothing soiled or torn removed
immediately and person decontaminated immediately and person decontaminated using 10% bleachusing 10% bleach
Eating, drinking, smoking, or applying Eating, drinking, smoking, or applying makeup not allowed at scenemakeup not allowed at scene
Non-disposable items placed in labeled bag Non-disposable items placed in labeled bag and laundered by qualified serviceand laundered by qualified service