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FSC239 > 5) BPA > Flashcards

5) BPA Flashcards

1
Q

BPA tells us about the _______ as opposed to the ________.

A

HOW as opposed to the WHO

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2
Q

Describe some special characteristics pertaining to blood.

A

Viscosity: approx 4+ times more viscous than water
Surface Tensions: Elastic-like property of the surface of blood that tends to make it contract; caused by cohesive forces of molecules within blood

When a blood drop travels through the air, it forms a spherical ball because of the surface tension of the liquid.

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3
Q

The ability of blood to reproduce specific patterns is not affected to any significant degree by:

A

Age
Sex
Alcohol/drugs
Disease process

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4
Q

Bloodstains created or formed by the force of gravity acting alone

A

Passive

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5
Q

Bloodstain pattern resulting from contact between a blood-bearing surface and another surface

A

Transfer

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6
Q

Bloodstain resulting from a blood drop dispersed through the air due to an external force applied to a source of liquid blood.

A

Spatter

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7
Q

What are some classification exceptions?

A

Dilution (cleanup)
Insect activity
Drying (liquid blood exposed to air will dry over a period of time)
Drying process
Decomposition (can alter/change appearance of bloodstains)
Clotting (change shape/appearance)
Voids (the absence of blood/bloodstains on a surface that has an otherwise continuous field of bloodstains)

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8
Q

Single blood drops.
Bloodstain is round on a smooth, flat surface
Oh a rough cement board, the rough shape of surface interferes with resulting bloodstain.

A

Drip Stains

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9
Q

Blood source is moving

A

Drip Trail

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10
Q

Blood dripping into blood.

Creates small satellite stains around the perimeter.

A

Drip Pattern

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11
Q

Volume of blood that is greater than a single drop of blood.

A

Splash Pattern

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12
Q

Seen a lot in violent crime scenes.

Liquid blood now on a surface such as the ground will migrate to the lowest point on the surface as a result of gravity.

A

Pool Pattern

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13
Q

On vertical surfaces.
Blood will travel/migrate down the surface of the wall because of gravity.
Can often give us indications that an object/person may have moved after blood has been deposited on a surface Iwhen you see flow patterns on a body that are not in agreement)

A

Flow Pattern

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14
Q

Interaction of liquid blood with a porous surface

A

Saturation Pattern

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15
Q

Bloodstain pattern resulting from contact between a blood-bearing surface and another surface

A

Transfer

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16
Q

Takes place where there is an existing bloodstain on a surface and another object interacts with that existing bloodstain

A

Wipe

17
Q

Created where you have interaction between a bloody surface & another surface; defining feature is that their is relative movement between those surfaces; striations)

A

Swipe

18
Q

In spatter bloodstains, when applied force is greater…

A

Stain size decreases

19
Q

Mechanical or liquid pressure being applied to liquid blood
Seen often when blood is exiting from an injury site on a body from a vessel (artery/vein)
Blood exiting that vessel is under pressure so it is being hydraulically propelled from the injury site

A

Projected Spatter

20
Q

Liquid blood on a surface of an object and that object is going through some range of motion.
Will frequently see a linear arrangement of the spatter stains.

A

Cast-off Spatter

21
Q

Created where you have an interaction between the airway of an individual & the liquid blood that might be in that airway (coughing, sneezing, loud talking).
Presence of air being trapped within the bloodstains

A

Expiration Spatter

22
Q

Will propel blood through the air and disrupt it to the point where the bloodstains can be very small (mist like stains)

A

Firearms spatter

23
Q

Created where you have an object striking some source of liquid blood (ex: beatings, punch, kick, someone being struck with a bat, hammer, stick)

A

Impact spatter

24
Q

Small tails form when a droplet of blood strikes the surface at an angle. What do those tails tell us?

A

The direction that blood was travelling at the time of the collision between the blood and that surface.

25
Q

Angle of impact (blood becomes more ________________ in shape when angle becomes more acute under 90 deg)

A

Elliptical

26
Q

Leuko Crystal Violet (LCV) reacts with ______________ within blood & you get a __________ _________.

A

Hemoglobin

Colour change

27
Q

Why are documenting changes to a scene important?

A

So that we can demonstrate what changes have taken place & what bloodstains are part of the crime scene and what artifacts were created by staff during the examination of the crime scene

28
Q

IR Photography (Infrared Photograph) is a technique for when we have bloodstains deposited on…

A

Black or dark surfaces like a black shirt

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