the biological crime scene "every contact leaves a trace". dr. edmond locard blood at the...
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The Biological Crime Scene
"Every Contact Leaves a Trace".
Dr. Edmond Locard
Blood at the Scene is the most visible example of the Locard Exchange Principle
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Solving Forensic Problems
Steps to problem solving Understand the Problem
The parameters The issues
Knowledge Key to any successful analysis
Understand the science Know the technology
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The Mission: Never Miss Anything
The ToolsThe Evidence Cascade
Your Brain
Experience
The Underlying Science
Understanding the Technology
Logical & Critical Thinking
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Pattern Analysis
The Evidence Analysis Cascade
Trace Evidence
Presumptive Testing
Scrapping Tape lift
Gross Visual Examination
Tactile Analysis
Stereomicroscopy
Genetic Marker Testing
ImmunoChromat.
HairsFibers
Soil/Paint/Glass
Pattern Analysis
Impression Evidence
BiologicalEvidence
ChemicalTesting
EnzymeTesting
Confirmatory Testing
Species Testing
MicrocrystalAnalysis
ALS
Blood, Semen, Saliva
Lectins
DNA
Confirmatory Testing
MicroscopyInstrumentalAnalysis
Immuno.Chromat.
Pattern Analysis
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Forensically Important Biological Substances
What are the they? Blood Semen Saliva Urine Feces Vomit Fingerprint residue Sloughed off cells
What else? Bacteria Plant material Pollen Viruses
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Locating Biological Evidence
Your Eye Touch
Hi-Intensity & Alternate Light SourcesChemical Tests
Enzymatic Tests Immunological Tests
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Blood
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Blood
Cells Liquid
Red Blood CellsWhite Blood Cells
Plasma Serum
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Plasma Cells
BloodComplex
Connective Tissue
Salts
Blood GroupAntigens
Antigens
Drugs
Hormones
Antibodies
DNA
HLA Antigens
Blood Group Substances
White Cells Red Cells
Enzymes
Isoenzymes
Genetic Markers
Individual Specific
Antibodies
Forensically Speaking: What is Blood?
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Genetic Markers
Drugs of AbusePrescriptions
IdentificationPsychological Behavior
Disease Susceptibility
Individual Identity
Ancestry Sexing
Racial Identity
Forensically Critical Information from Blood
DNA Profiling
Antibody Profiling
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The Scientific Faces of Forensic Biology
Chemistry
Immunology/Chemistry
Serology/Biochemistry
Molecular Biology
Population Genetics
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The Investigators JobFind Those Stains!
Presumptive Testing Tools
Tactile/Visual Analysis
BiologicalEvidence
ChemicalTesting
EnzymeTesting
ALS
Blood, Semen, Saliva
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Using Alternate Light SourcesTo Find Biological Evidence
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The Electromagnetic Spectrum Using Light to Find Biological Evidence
190-290 290-400
Ultraviolet Region
Shortwave
Longwave
Visible Region
400-455 455-492
>700
492-577 577-597 597-622 622-700
Infrared Region
Violet Blue Green Yellow Orange Red
IR
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ALS WavelengthsApplications to Finding Biological Evidence
Bone 455/CSS/515 Orange OrangeTeethFingernails
Body Fluids CSS Orange 1-2 Orange Dk Surfaces UV Clear/Yellow None “ w/crust White/oblique Clear None
Evidence Type MiniScope 400 settings Goggle Camera Filter
Hair untreated Blk White/oblique Clear None treated-red/bld 415/CSS Yellow/Orange Yellow/Orange
Blood 415, 455 Clear/Yellow None
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Choosing a Goggle Color
Color Range ALS Setting (nm) GoggleLong wave UV 300-400 ClearViolet 515-445 YellowBlue/green 455-515 OrangeGreen-red 536 Red - - - - - - CSS Orange
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Detecting Blood @ the Scene
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Historical Overview
Classification
1862
Chemistry
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Chemical Testing
Catalytic Tests
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Blood – Presumptive testsBased on the peroxidase properties of hemoglobin
globin
heme
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Blood – Presumptive tests
heme
porphyrin
iron
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Catalytic Tests: Presumptive Testing for Blood
Van Deen’s or Day’s Test 1862
Kastle Meyer 1901
Benzidine 1904
Tetramethylbenzidine 1976
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Common Presumptive Tests
phenolphthalin (Kastle-Meyer)
leucomalachite green (LMG)
Luminol (BlueStar)
3,3’,5,5’-Tetramethylbenzidine (TMB)leucocrystal violet (LCV)
o-tolidine
Benzidine: Carcinogenic
o-toluidine
hydrogen peroxide: Bubbles
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Presumptive TestingPractical Variations
One step All reagents added together
Considered to be most sensitive
Doesn’t allow for identifying false positives
Two Step Reagent added to the stain Peroxide added last
Three Step Alcohol added first Reagent second Peroxide last
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Blood – Presumptive testsGeneral Considerations
heme has peroxidase activity
2H2O2
2O· + 2H2O
Heme Fe+++
Oxygen free radicals
cleaved from peroxide group
Heme Fe++
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Blood – Presumptive testsGeneral Considerations
Free radicals interact
with organic chemicals (dyes)
O· chemical oxidized
Presumptive test detects oxidized organic dyes
+ Chemical reduced
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Kastle-Meyer Test
Rare
Some substances inhibit reaction
Blood can mask the color change
Acidic solutions can mask the reaction
false negatives
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BlueStarTM
LuminolLuminol3-3-aminophthalateaminophthalate
+N+N22
+ + lightlight
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Using IR to Search for Blood
Camera Viewfinder
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Semen
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Plasma Cells
SemenComplex
Connective Tissue
Salts
Blood GroupAntigens
AntigensDrugs
Hormones
Antibodies
DNA
HLA AntigensBlood Group
Substances
White Cells
Sperm Cells
Enzymes
Isoenzymes
Genetic Markers
Individual Specific
Antibodies
Pre-Sperm Cells
Genetic Markers
Isoenzymes
Forensically Speaking: What is Semen?
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Contributing gland Percentage of ejaculate Testicles and epididymus 5 per cent
Seminal vesicles 46 to 80 per cent
Prostate gland 13 to 33 per cent
Bulbourethral and urethral glands 2 to 5 per cent
Semen Origins
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Identifying SemenTest Type Specificity
Microscopic TestsSpermatozoa ………………19th Century…….............. Specific
Visual TestsCrusty stains ……………………………………………. NonspecificColor of stain ……………………………………………. NonspecificUV Light Phosphorescence ……1950’s, 1970’s…….. Nonspecific Alternate Light Sources …………1980’s……………... Nonspecific
Chemical / Crystals Tests Florence Test …………19th Century..………………… NonspecificBarberio Test …………19th Century..………………… NonspecificFructose/Zn …………..1950’s……………………….. Nonspecific
Enzyme/Protein TestsAcid Phosphatase ………………1950’s………………. NonspecificLactic Dehydrogenase-X ……… 1980’s………………. Specific for spermSperm/seminal Esterases ………1980’s……………… NonspecificGamma seminoprotein ……………1980’s……………. Specific for seminal plasma
Immunological TestsProstate Specific Antigen (p30) ......1980’s.............. Specific for seminal plasmaABACard p30 Test ………………….1990’s…………. Specific for seminal plasma
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Locating Dried SemenVisual Examination First
Stain Appearance Crusty stains Yellow stains on aging Mixed with blood
Light red (diluted appearing) or streaks with blood Menstrual blood Blood from trauma Blood of assailant
Tactile Feel the “crust” of the stain
Stereomicroscopic Examination Characteristic “look” of dried biological material
Extremely small stains
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Semen – Presumptive tests visual exam
touch UV light (λ ~ 495nm or CSS)
Long wave UV w clear goggles
enzymatic test acid phosphatase (AP) reagent
crystal test Florence test - Choline Barberio test - Spermine
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Sodium a-naphthyl phosphate broken down by AP frees naphthyl group
Fast Blue o-dianisidine combines with naphthyl
group
produces scarlet red color
Acid phosphatase testSemen – Presumptive tests
a-naphthyl phosphate
Acid P
hosphatase
o-dianisidine
Scarlet Color
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Article Color Fiber W Light UV Laser Old ALS
pants blue Cot/poly --------- --------- --------- ---------
Bed sht white Cotton 1-4 1-4 1-16 1-8
panties white Nylon 1-4 1-2 1-4 1-2
shirt Cream/rd acetate 1-2 1-16 1-16 1-16
shirt Y/brown polyester --------- --------- 1-2 ---------
sweater Gray/blk Poly/ct/ray --------- --------- 1-4 ---------
sweater navy Nylon/acry neat 1-2 1-2 1-2
sock gray Poly/ct/ray --------- 1-4 1-4 1-4
sock white Poly/ct/ray 1-2 1-4 1-8 1-8
Detection of Semen Using Light Sources
Auvdel, M: Comparison of Laser & UV Techniques Used in Detection of Body SecretionsJFS: 32(2) 1987, 326-345.
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Using the ALS To Locate
Semen Stains
1968 Case Analyzed in 2005CSS setting – Orange Goggles
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Vaginal Secretions
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Electrophoretic Separation of Vaginal & Seminal Acid
Phosphatases
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SAP/VAP Electrophoresis
SAP
VAP
Bacterial
Laboratory Technique for Separating Seminal from Vaginal Acid Phosphatase
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Immunological Tests for Semen
Prostate Specific Antigen (p30)
Cross-over electrophoresisRocket electrophoresisElisaImmunological Chromatography
ABAcard p30 Test CardRSID (semenogelin )
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Saliva
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Oral Fluid Cells
SalivaComplex
Connective Tissue
Salts
Blood GroupAntigens
AntigensDrugs
Hormones
AntibodiesDNABlood Group
Substances
Epithelial Cells
Enzymes
Isoenzymes
Genetic Markers
Individual Specific
Antibodies
Genetic Markers
Forensically Speaking: What is Saliva?
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Using the ALS To Locate Saliva Stains
1968 Case Analyzed in 2005CSS setting – Orange Goggles
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Total AMY Levels in Semen & Saliva
Saliva ………………………………………………… 94x10Semen (vasectomized) …………………………….. 10Semen (aspermatic) ………………………………... 18
3
Body Fluid Avg. [AMY]
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Two Amylases in the Human Body
AMY 1
Blood Saliva
AMY 2
Blood PancreasVag. Sec.
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Identifying Saliva
Presumptive Tests for AmylaseIdentification of High Levels of Amylase
Phaedebas – Scene versions of the testDiffusion into Starch Agarose – Scene adaptable
Differentiation of AMY1 v AMY2Plant Extracts - LectinsMonoclonal Antibodies agains AMY 1 & 2
mmunologyical ChromatograplhyABA Card Saliva Test – Amy 1RSID – Amy A
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Article Color Fiber W Light UV Laser Old ALS
pants blue Cot/poly --------- ---------
---------
---------
Bed sht white Cotton 1-2 1-8 1-16 1-16
panties white Nylon --------- ---------
neat ---------
shirt Cream/rd
acetate --------- ---------
1-2 ---------
shirt Y/brown polyester --------- ---------
---------
---------
sweater Gray/blk Poly/ct/ray --------- ---------
---------
---------
sweater navy Nylon/acry neat neat neat neat
sock gray Poly/ct/ray --------- ---------
---------
---------
sock white Poly/ct/ray --------- ---------
---------
---------
Detection of Saliva Using Light Sources
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Urine
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Liquid Cells
Urine
Salts Drugs
Hormones
DNA
Epithelial Cells
Genetic Markers
Forensically Speaking: What is Urine?
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Substance Urine Serum Saliva Semen Sweat
phosphate 70-105 2.4-3.76 7.4-21.1 11 .009-.043
sulfate 14.5-122.5 .45 - - 0.7-7.4
creatinine 105-210 0.6 0.275-0.455 - 0.1-1.3
creatine 0-14 2.7 - 20 -
urea 1400-3500
16-35 0-18.1 72 12-57
uric acid 5.6-21 1.6-3.9 0.5-8.7 6 0.07-0.25
Concentrations of Components of Urine -v- Other Fluids
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Locating Urine StainsMicroscopic, UV & Odor
FluorescenceUV Light: can help locate
color variesALS: fluoresces weakly under different
wavelengths
OdorGentle heating Kirk (1953) said most specific test for urine
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FecesOdorColor
Visual appearanceDissolution in water followed by heating
Cellular Material (vegetable – cells w/DNA)
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Confirming Human OriginImmunology in a Card Format
Immunological Chromatography
BloodSemen
Saliva - ID
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Human BloodCross-reaction with Ferret BloodAnti-human Hemoglobin
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Human BloodCross-reaction with Ferret BloodAnti-human Hemoglobin
![Page 59: The Biological Crime Scene "Every Contact Leaves a Trace". Dr. Edmond Locard Blood at the Scene is the most visible example of the Locard Exchange Principle](https://reader034.vdocuments.mx/reader034/viewer/2022042821/56649c955503460f949521ad/html5/thumbnails/59.jpg)
Human Blood – RSIDGlycophorin-A
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Saliva – RSID CardAmy A
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Human Blood – OBTIHuman-Ferret Cross-reaction
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Old StainsCold Cases
Never Trust a Negative Presumptive Test
Typical Problems1.Degradation2.Oxidation3.Contamination4.Solubility5.Stupidity
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Quality Assurance
Reagent:Test Date 1:10,000 1:100,000 1:1,000,000 Comments
Kastle Meyer:4/15/09 + + Wk Cut off @ 100,000
Kastle Meyer:9/15/09 + + Wk Cut off @ 1,000,000
Kastle Meyer: 1/15/10 + wk - Does not meet standard
Kastle Meyer: 1/15/10 + + = Fresh reagent – Meets Standard