Crime Scenes: Science and EngineeringCrime …...Crime Scenes: Science and EngineeringCrime Scenes:...
Transcript of Crime Scenes: Science and EngineeringCrime …...Crime Scenes: Science and EngineeringCrime Scenes:...
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Crime Scenes: Science and EngineeringCrime Scenes: Science and EngineeringCrime Scenes: Science and EngineeringCrime Scenes: Science and EngineeringCrime Scenes: Science and EngineeringCrime Scenes: Science and EngineeringCrime Scenes: Science and EngineeringCrime Scenes: Science and Engineering
Westinghouse Science Honors InstituteWestinghouse Science Honors Institute
Special Agent Andrea DammannFederal Bureau of Investigation
Pittsburgh PennsylvaniaPittsburgh, Pennsylvania
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When A Crime Occurs:When A Crime Occurs:There exists a scene containing the evidence of There exists a scene containing the evidence of
the crime…the crime…
andandandand
Th i l b t d t i thTh i l b t d t i thThe crime laboratory ready to examine the The crime laboratory ready to examine the evidence for the information it contains.evidence for the information it contains.
But, there is a gap between the two.But, there is a gap between the two.
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The gap between the crime scene and The gap between the crime scene and the laboratory is filled by the work ofthe laboratory is filled by the work ofthe laboratory is filled by the work of the laboratory is filled by the work of the Evidence Response Teamsthe Evidence Response Teams
�ERT��ERT�
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How does the evidence get from the How does the evidence get from the crime scene to the lab?crime scene to the lab?crime scene to the lab?crime scene to the lab?• Someone must properly document the
original conditions at the scene and the workoriginal conditions at the scene and the work done to collect the evidence from the scene.
• Someone must decide which items at the• Someone must decide which items at the scene are evidence and which are not.
• Someone must decide how to properly• Someone must decide how to properly collect the evidence, and then do it.
• Someone must be qualified and able to tell a• Someone must be qualified and able to tell a jury how it was all done in order to have the evidence accepted into court.
��ERTs do all of the above!ERTs do all of the above!p
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Underwater Search and Evidence Underwater Search and Evidence R T (USERT)R T (USERT)Response Team (USERT)Response Team (USERT)
P id t f tifi d di• Provides teams of certified divers• Forensically trained
E i d ith t t f th t f i l• Equipped with state-of-the-art professional dive team equipment
• Four Established Teams:• Four Established Teams:• New York• Miami• Miami• Los Angeles• Washington Field Office• Washington Field Office
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H R i D t tiH R i D t tiHuman Remains DetectionHuman Remains Detection� Canine capable of
scenting the odor of h d itihuman decomposition.
� Can recognize� Can recognize decomposition odor in various forms (ie body, b d t bl d t )body parts, blood etc).
� Buried or submerged� Buried or submerged under water.
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Human Scent Evidence TeamHuman Scent Evidence TeamHuman Scent Evidence TeamHuman Scent Evidence Team
� Specially trained human scent discriminating caninescanines
� Non-destructive scent collection techniques.
� Techniques to provide investigative leads by
d ti t t hconducting scent-match checks
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T i iT i iTraining…Training…Initial Initial 80 H B i C T W k• 80-Hour Basic Course - Two Weeks• Crime Scene
ManagementManagement• Documentation
S h T h i• Search Techniques• Evidence Issues
Reco er• Recovery • Packaging• Preservation
• Forensic Skills
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TrainingTraining Ad dAd dTraining…Training…AdvancedAdvanced
– Forensic Anthropology
– Post Blast and Large Vehicle Bombing Investigations
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T i iT i iTraining…Training…AdvancedAdvancedBloodstain Pattern
– Advance Crime Scene Photography
– Bloodstain Pattern Interpretation
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Bloodstain Pattern AnalysisBloodstain Pattern Analysis
Can be used to reconstruct the crime:
Type of force usedType of force usedPoint(s) of originNumber of blowsSequence of eventsPosition of victim and perpetratorMovement of people and objectsMovement of people and objects
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HighHighV l itV l it
Medium VelocityMedium VelocityVelocityVelocity
Low VelocityLow Velocity
(image�source:�Peel�Regional�Police,�2002)Ppt created by Hochrein (2010)
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Surface TextureSurface TextureSurface TextureSurface Texture
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Ppt created by Hochrein (2010)
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N
XY
Ppt created by Hochrein (2010)
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Ppt created by Hochrein (2010)
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162.6cm162.6cm
XX
Ppt created by Hochrein (2010)
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162.6cm162.6cm
XX
40.6cm40.6cm YY
Ppt created by Hochrein (2010)
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Di i f T lDi i f T lDirection of TravelDirection of TravelStain shape will indicate direction of
travel–Round – 90 deg–Elongated - angleg g–Round smooth end – toward the origin–Tail end points in the direction of travela e d po ts t e d ect o o t a e
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Ppt created by Hochrein (2010)
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A l fAngle of I tImpact
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Determining Angle of ImpactDetermining Angle of Impact
Angle of ImpactAngle of Impact
Opposite SideOpposite Side
HypotenuseHypotenuse
Ppt created by Hochrein (2010)
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FORMULAS YOU NEED TO KNOWFORMULAS YOU NEED TO KNOW
Ppt�created�by�Hochrein�(2005)Ppt created by Hochrein (2010)
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Determining Angle of ImpactDetermining Angle of ImpactStep 1.Step 1. Measure the length and width of Measure the length and width of each bloodstain.each bloodstain.Step 2.Step 2. Divide the width by the length to Divide the width by the length to calculate the sine of the impact angle.calculate the sine of the impact angle.(Th i i th f ti f t l i i ht t i l(Th i i th f ti f t l i i ht t i l(The sine is the function of an acute angle in a right triangle, (The sine is the function of an acute angle in a right triangle, equal to the ratio of the opposite leg to the hypotenuse.) equal to the ratio of the opposite leg to the hypotenuse.)
Width = .56cmWidth = .56cm
Length = 3.21cmLength = 3.21cm
Sine = .1744548Sine = .1744548
Inverse Sine of 1744548 = Angel of ImpactInverse Sine of 1744548 = Angel of Impact
Measure the mass of thedrop, not the total length.
Inverse Sine of .1744548 = Angel of ImpactInverse Sine of .1744548 = Angel of Impact
Angle of Impact = ____Angle of Impact = ____1010Ppt�created�by�Hochrein�(2005)Ppt created by Hochrein (2010)
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Determining theDetermining theP i t A f CP i t A f CPoint or Area of ConvergencePoint or Area of Convergence
Step 1.Step 1. Calculate the angle of impact.Calculate the angle of impact.
Step 2.Step 2. Using strings, lasers, or draw Using strings, lasers, or draw through the long axes of the bloodstains, through the long axes of the bloodstains, fi d h th i t t ( i t ffi d h th i t t ( i t ffind where they intersect (point of find where they intersect (point of convergence).convergence).
(image�source:�James&Eckert,�1999) Ppt created by Hochrein (2010)
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139.7cm139.7cm
72.4cm72.4cm
Ppt created by Hochrein (2010)
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Determining theDetermining theP i t A f O i iP i t A f O i iPoint or Area of OriginPoint or Area of Origin
Step 3.Step 3. Measure the distance from the base of Measure the distance from the base of ppthe individual bloodstains to the point of the individual bloodstains to the point of convergence convergence (This will represent the value of the (This will represent the value of the Y axis in calculating the point of origin)Y axis in calculating the point of origin)..
(image�source:�James&Eckert,�1999)
Ppt created by Hochrein (2010)
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35.6cm35.6cm
Ppt created by Hochrein (2010)
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FORMULAS YOU NEED TO KNOWFORMULAS YOU NEED TO KNOW
Ppt�created�by�Hochrein�(2005)Ppt created by Hochrein (2010)
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Determining theDetermining theP i t A f O i iP i t A f O i iPoint or Area of OriginPoint or Area of Origin
Step 5.Step 5. Calculate the point or area ofCalculate the point or area of originoriginStep 5.Step 5. Calculate the point or area of Calculate the point or area of originorigin(the elevation in space which is the Z axis)(the elevation in space which is the Z axis) using the using the following equation:following equation:
Tangent of the Angle of ImpactTangent of the Angle of Impact(Tan of 21 degrees = (Tan of 21 degrees = .3839.3839))
XX
Distance from point of convergenceDistance from point of convergencep gp gto bloodstain (Y axis) = to bloodstain (Y axis) = 35.6cm35.6cm
Point of OriginPoint of OriginPoint of Origin Point of Origin (Distance from Surface)(Distance from Surface)
(Z axis)(Z axis)== 13.67cm13.67cm
Ppt created by Hochrein (2010)
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CastCast--Off PatternsOff PatternsCastCast Off PatternsOff Patterns�Created by blood thrown from a bloody
object during “whip like” termination of aobject during whip-like termination of a back stroke�Characterized by linear (in line) stain pattern�Characterized by linear (in-line) stain pattern�Shape of drops change from round on the
d i i t l t d t f dend near origin to elongated at far end� Can tell:
– Minimum number of blows– Where the killer was when the blows were
d i i t dadministered
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S i li d E iS i li d E iSpecialized EquipmentSpecialized EquipmentTotal Station
Hochrein 2002
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HOW IT WORKSHOW IT WORKSHOW IT WORKSHOW IT WORKS
Ppt created by Hochrein (2005)
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Southeast IsometricView ofFoyerFoyer
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What is DNA?What is DNA?
D ib N l i A idA T
� DeoxyriboNucleic Acid� found in most cells� two strands form a twisted ladder
G CGC � two strands form a twisted ladder
� ladder rungs made of pairs of “bases”-- building blocks of DNA
GCA T
4 bases -- G, C, A, T� bases are used as an alphabet
ATG C � order of bases is important
123-1234 vs. 321-4321
G CA T
GC
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Sources of DNASources of DNA
NuclearNuclear� 2 copies of each gene� inherited from both� inherited from both
parents� unique to individual
Xq
Mitochondrial100’ t 1000
XX
� 100’s to 1000 copies/cell
� maternally inherited� maternally inherited� not unique to individual
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Maternal Inheritance
1st generation
2ndgenerationg
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Advantages of mtDNAAdvantages of mtDNA• Can get results in situations where unable to getCan get results in situations where unable to get
nuclear DNA -hair teeth bones degraded DNA-hair, teeth, bones, degraded DNA
• Missing persons cases-because mtDNA is maternally inherited, can use maternal relative as known to compare to remains
• Highly variable between unrelated individuals
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Femur ComparisonHuman femaleHuman female
Large DogLarge Dog DeerDeerLarge DogLarge Dogg gg g DeerDeerSmall DogSmall Dog
g gg g
SheepSheepPigPig
SheepSheep
Black BearBlack Bear
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Sarah Rae BoehmSarah Rae Boehm
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Local CaseLocal Case –– Western PA andWestern PA andLocal Case Local Case –– Western PA and Western PA and WVWV
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USAi Fli h 427USAi Fli h 427USAir Flight 427USAir Flight 427September 8, 1994
E t f Chi– Enroute from Chicago– Crashed in Hopewell Twp.– All on board were killed
• 127 passengers5 b• 5 crew members
– ERT worked with FBI Disaster Squad in to identify victimsSquad in to identify victims
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I S iI S iIra SwearingenIra Swearingen
– DisappearedDisappeared December 12, 1999
S h f b– Search of burn barrels January 1, 2000January 1, 2000
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Greene County – November 29, 2000
Shell CasingShell Casing
Skeletal RemainsSkeletal Remains
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F i WilliF i WilliFrancis WilliamsFrancis Williams� Francis Williams
– Killed August 18, 1999– Search of home January 14-15, 2000
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O h L l CO h L l COther Local Cases. . .Other Local Cases. . .
�Jessica Newell - 1997– Martinsburg, WV
�Shenee Freeman 1997�Shenee Freeman - 1997– Oil City, PA
�Tausha Lanham - 1998WV and Burgettstown PA– WV and Burgettstown, PA
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O h L l CO h L l COther Local Cases. . .Other Local Cases. . .�Joyce Wroczynski - 2001
– Putnam County WVPutnam County, WV
Annette Bright 2001�Annette Bright – 2001– Westmoreland County, PA
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C ll B bC ll B bAugust 28, 2003
Collar BombCollar Bombg ,
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O h L l CO h L l COther Local Cases. . .Other Local Cases. . .� Kelly Jo Elliott –
– Killed 5/2006Killed 5/2006 Ohio County, WV
– Body recovered 11/2006 yClearfield County, PA
� Gabrielle Becen – 6/2006– Green County, PAGreen County, PA
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Joshua Michael RidingsJoshua Michael RidingsJoshua Michael Ridings Joshua Michael Ridings February 20, 2007 February 20, 2007 –– Wheeling, WVWheeling, WV
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Major CasesMajor CasesMajor CasesMajor CasesNational
International
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World Trade CenterWorld Trade CenterWorld Trade CenterWorld Trade Center
New York, New YorkNew York, New YorkFebruary 26, 1993
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Murrah Federal Murrah Federal Murrah Federal Murrah Federal BuildingBuildingBuildingBuilding
Oklahoma City, OKOklahoma City, OK April 19, 1995
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UNABOMUNABOM Theodore KaczynskiTheodore KaczynskiUNABOM UNABOM –– Theodore KaczynskiTheodore Kaczynski
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Khobar TowersKhobar TowersKhobar TowersKhobar Towers
SAUDI ARABIAJune 25, 1996Ju e 5, 996
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TWA Flight 800TWA Flight 800TWA Flight 800TWA Flight 800
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US Embassy BombingsUS Embassy BombingsUS Embassy BombingsUS Embassy BombingsAugust 7, 1998
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KKKKKosovoKosovoKosovoKosovo
War Crimes1999
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USS ColeUSS Cole -- YemenYemenUSS Cole USS Cole YemenYemen
October 12, 2000
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September 11 2001September 11 2001September 11, 2001September 11, 2001
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W ld T d CW ld T d CWorld Trade CenterWorld Trade Center
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Th PTh PThe PentagonThe Pentagon
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U it d Fli ht 93United Flight 93
Shanksville, Pennsylvania
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Evidence Response TeamsEvidence Response Teams
�Pittsburgh �Detroitg�Cincinnati �Indianapolis�Chicago�Cleveland
�Knoxville�Louisville�Cleveland �Louisville
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I SiI SiImpact SiteImpact Site
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Th O iTh O iThe Operation…The Operation…
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Space Shuttle ColumbiaSpace Shuttle ColumbiaSpace Shuttle ColumbiaSpace Shuttle Columbia
F b 1 2003February 1, 2003
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Riyadh Saudi ArabiaRiyadh Saudi ArabiaRiyadh, Saudi ArabiaRiyadh, Saudi Arabia
May 12, 2003May 12, 2003
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E i R d l hE i R d l hEric RudolphEric Rudolph� Olympic Park Bombing
Atlanta, GA 1996
� Abortion Clinic Bombings Atlanta and BirminghamAtlanta and Birmingham 1996-1998
� Captured May 31, 2003 Murphy, NC
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H it i Mi iH it i Mi iHumanitarian MissionHumanitarian MissionTsunami 2005
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I35W B id C llI35W B id C llI35W Bridge CollapseI35W Bridge Collapse� Minneapolis, MN
A t 2007– August 2007
� ERT– Total Station Mapping
of Scene
� USERT – Victim Recovery– Evidence Recovery
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M R lM R lMost Recently….Most Recently….
DC M t C h•DC Metro Crash•Afghanistan•Iraqq
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Q ti ?Q ti ?Q ti ?Q ti ?Questions?Questions?Questions?Questions?