trace evidence part ii. summary microscopic analysis types of trace evidence glass hair (fur) ...
TRANSCRIPT
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Trace EvidencePart II
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Summary
Microscopic Analysis Types of Trace Evidence
Glass Hair (fur) Fibers
Paint Soil Gunshot Residue
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Hair
What is hair? What crimes are hair involved in? How is hair collected? How is hair analyzed in the lab?
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What is hair?
Natural fibers of animal origin Terms: human = hair; animal = fur Usually growing (live root)
Trace > Hair
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Cellular material in the hair shaft (mtDNA)
Good DNA in the hair root for forcibly removed hairs (STR)
Trace > Hair
What is hair?
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What crimes are hairs involved in?
Hairs are shed from people; can link a person to a crime scene.
Animal fur may also link a person to a crime scene.
Trace > Hair
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Visually by hand or with forceps. Possibly tape lift. Packaged in sealed containers.
Trace > Hair
How is hair collected?
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Look at class characteristics (microscope):
Color Medulla, Cortex, Cuticle
Trace > Hair
How is hair analyzed?
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Medulla: Species ID or human ID Present, absent, or fragmented
Line down middle of hair
Trace > Hair
How is hair analyzed?
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Cortex: Color of hair Species ID or human ID May contain pigment blotches May contain air pockets
Trace > Hair
How is hair analyzed?
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Cortex:
Humans = 1 color entire length Animals = color can vary at
root/middle/tip
Trace > Hair
How is hair analyzed?
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Cuticle:
“Scales” on outside of hair Species ID only Humans = imbricate
Trace > Hair
How is hair analyzed?
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How is hair analyzed? (cuticle)
Procedure: Put clear nail polish on slide. Place hair in nail polish; wait
to harden. Remove hair; look at
indentations in nail polish (microscope).
Trace > Hair
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Fibers
Fibers are very useful as trace evidence:
Vary widely in class characteristics color, shape, chemical composition, etc.
Easily transferred from one source to another (carpets, clothes, etc.)
Significant persistence (won’t degrade)
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How are fibers used as evidence?
As with other trace evidence, fibers can be transferred to/from a person or objects linking them to one another.
Trace > Fibers
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How long do fibers persist?
Most fiber evidence is lost (fall off) a short time after the transfer occurs.
The fibers that do remain will be persistent.
Trace > Fibers
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Fibers can be classified into three main categories:
Natural (animal, plant, mineral) Manufactured Synthetic
Trace > Fibers
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Natural Fibers:
Found in nature Can be artificially colored or treated
Cotton Wool Hemp
Trace > Fibers > Natural
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Animal Fibers
Wool - Hairs from sheep Most common of animal fibers Hairs are spun to form thread
Silk - comes from silkworm Spun as double filament (separated before use)
Because of length, doesn’t shed easily
Other Hairs from Animals
Trace > Fibers > Natural
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Plant Fibers
Cotton - seed hairs of cotton plantby far most common fiber (find almost everywhere)
Under microscope, fibers resemble twisted ribbon
Trace > Fibers > Natural
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Linen - stem fiber from flax plant
Kapok - from seed hairs of kapok plant
Other fibers - Manila, hemp, sisal, jute
Other Plant Fibers:
Trace > Fibers > Natural
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Mineral Fibers
Asbestos - crystalline material Used to be used for insulation Fractures into thin rods that
can get into your lungs; can kill you
Not used much anymore
Trace > Fibers > Natural
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Filament: Long continuous fiber (like silk)
Staple: Filament is cut into smaller pieces; staples are spun together to form thread (like cotton)
Trace > Fibers
Filament vs. Staple
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Manufactured Fibers
Regenerated Fibers
Trace > Fibers > Manufactured
Example: Rayon
Cellulose is dissolved, then resolidified to form the polymer fiber
Can occur in filament or staple form
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Examples:
Nylon and Polyester
Man made Can also be filament
or staple
Trace > Fibers > Synthetic
Synthetic Fibers
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Acrylics More common as
evidence Usually in staple form Staples spun together,
similar to wool
Trace > Fibers > Synthetic
Synthetic Fibers
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Begin by identifying and comparing class characteristics for unknown sample (evidence) and known sample.
Unknown Known
Trace > Fibers > Analysis
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Fibers from rug in a van.
Fibers found on victim.
Trace > Fibers > Analysis
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Class characteristics
Trace > Fibers > Analysis
Color: microscopic examination
Size: length and width can be measured
Shape: cross section is viewed
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Refractive Index – n. The ratio of the speed of light in air
or in a vacuum to the speed of light in another medium. Other microscopic properties (PLM)
Trace > Fibers > Analysis
Class characteristics
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Chemical Composition: determined by advanced instrumentation
Trace > Fibers > Analysis
Class characteristics
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Threads, Yarn, Rope, Cordage
Smallest component is fibers (staple) twisted together to form thread or is a filament.
This thread can then be twisted with other threads to form a thicker thread (string, etc.)
This thicker cord can then be twisted with other thicker cords, etc.
Trace > Fibers > Cordage
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Threads, Yarn, Rope, Cordage
At each step, the number of cords can be counted.
At each step, the twist direction is either “S” or “Z”
Small cords or fibers twisted together to form larger cords
Trace > Fibers > Cordage
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Fiber niso nll n Biref MP (ºC)
K1 1.518 to 1.528 1.544 to 1.551 1.505 to 1.516 0.035 to 0.039 Does not melt
K2 1.777 to 1.877 2.050 to 2.350 1.641 to 1.646 0.200 to 0.710 Does not melt
K3 1.512 to 1.521 1.510 to 1.520 1.512 to 1.525 -0.001 to -0.005
Does not melt
K4 1.538 to 1.539 1.530 to 1.539 1.538 to 1.539 -0.000 to -0.002
192 – 210
K5 1.533 to 1.545 1.568 to 1.583 1.515 to 1.526 0.049 to 0.061 210 – 230
K6 1.540 to 1.541 1.577 to 1.582 1.515 to 1.526 0.056 to 0.063 250 – 264
K7 1.522 1.553 1.507 0.046 182 – 186
K8 1.535 to 1.539 1.568 to 1.574 1.518 to 1.522 0.050 to 0.052 133 – 138
K9 1.567 to 1.575 1.632 to 1.642 1.534 to 1.542 0.098 to 0.102 282 – 290
K10 1.474 to 1.478 1.474 to 1.479 1.473 to 1.477 0.002 to 0.005 245 – 260
Q 1.520 1.515 1.513 -0.003 Does not melt
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Glass
What is glass? What crimes are glass involved in? How is glass collected? How is glass analyzed in the lab?
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What is glass?
Made from fused inorganic materials Amorphus; not crystalline (molecules not arranged)
Varies in elemental formula Many shapes and colors
Trace > Glass
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How is glass involved in crime?
Small fragments can be used as trace evidence (link objects/people)
Crime scene reconstruction
Trace > Glass
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How is glass collected?
For reconstruction, detailed photographs can be taken or the entire pane of glass is collected.
Trace > Glass
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For trace evidence, usually visually collected with forceps and packaged in plastic bags.
Trace > Glass
How is glass collected?
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For reconstruction:
Radial cracks
Concentric cracks
Trace > Glass
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Radial cracks
Concentric cracks
Concentric cracks
Trace > Glass
For reconstruction:
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When looking at a radial section, conchoidal fractures point back to the origin of the break
Core usually on opposite side of the origin
Trace > Glass
For reconstruction:
1. Determine the direction of projectile.
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1
2
3
Trace > Glass
For reconstruction:
2. Determine the order of projectiles when dealing with more than one.
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1
2
3
Trace > Glass
For reconstruction:
2. Determine the order of projectiles when dealing with more than one.
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For trace analysis:
Done with microscopic analysis Color, curve, thickness, etc. Refractive index: Determined by placing glass
in oils of different refractive indexes
Trace > Glass
Associate unknown glass found at the crime scene with known samples to determine the source.
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Refractive index:
Low relief = no outside line R.I. of glass and oil are similar
High relief = thick outside line (Becke line) R.I. of glass and oil are different
Trace > Glass
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Paint
What is paint? What crimes are paint involved in? How is paint collected? How is paint analyzed in the lab?
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What is paint?
Colored chemical coating Covers cars and houses
Trace > Paint
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Paint contains 3 things: Vehicle – binds components together Pigment – gives paint color Extenders – used to modify gloss, texture,
opacity, etc.
What is paint?
Trace > Paint
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What crimes are paint involved in?
Hit and Runs – paint from car left at scene Other vehicular accidents Home invasion – windows; on suspect
Trace > Paint
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How is paint collected?
Visually by hand or with forceps. Packaged in sealed containers.
Trace > Paint
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How is paint analyzed?
1. Possibly a physical match (jigsaw-like)
2. Associate the unknown paint with a known sample (class characteristics)
Trace > Paint
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Chemical composition determined by FT-IR
Trace > Paint > Analysis
How is paint analyzed?
Chemical “Fingerprint”
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Paint can be in multiple layers
Each layer is analyzed to determine its physical and chemical properties.
Trace > Paint > Analysis
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Soil
What is soil? What crimes involve soil? How is soil collected? How is soil analyzed in the lab?
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What is soil?
Mixture of animal and vegetable materials, and minerals
In many ways, soil has a unique composition in a given area.
Trace > Soil
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What crimes involve soil?
Due to the widespread location of soil (earth), it can be used to associate people, objects, and scenes in numerous cases.
Trace > Soil
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How is soil collected & analyzed?
Materials in soil are identified and quantified.
Analysis relies on soil composition being: Consistent over time in one location Different in different locations
Trace > Soil
Collected in jars or vials.
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Gun Shot Residue (GSR)
What is gun shot residue (GSR)? What crimes are GSR involved in? How is GSR collected? How is GSR analyzed in the lab?
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What is GSR?
Mixture of materials that originate from the firing of a gun.
From the chamberFrom the
barrel
Trace > Gun Shot Residue
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GSR will fall onto hands of person firing the gun.
Trace > Gun Shot Residue
What is GSR?
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What crime is GSR involved in?
Crimes with guns
Trace > Gun Shot Residue
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How is GSR collected & analyzed?
Hand/glove/paw is swabbed
Trace > Gun Shot Residue
Elements barium and antimony are found in high levels.
Use powerful microscopy (SEM) Use chemical tests (color change reactions)
Analysis: