FIS 201 Exam 3 Mohr/ FIS 201 Exam 3 Mohr 2 SETS
COMPLIED WITH COMPLETE SOLUTION RATED A+ NEW
EDITION 2026
What are the requirement for a bloodstain pattern analyst? - Ans -no formal education
requirements
-certification through IAI and American Criminalistics Society
What are the 4 phases of stain creation? - Ans -contact/collapse
-displacement
-dispersion
-retraction
What is a bloodstain pattern? - Ans grouping or distribution of bloodstains that indicates the
manner in which the pattern was deposited
What two parts is blood compromised of? - Ans -hematocrit
-plasma
What happens in the contact/collapse stage of impact? - Ans Blood droplet his the object and
collapses from the bottom up
What happens in the displacement stage of impact? - Ans slight dimples and spines begin to
form around the edge of the drop
,What happens in the dispersion stage of impact? - Ans most of the volume of blood is forced
up and out so the spines are extended outward
What happens in the retraction stage of impact? - Ans surface tension pulls the drop flat and
the satellites with enough momentum break free
What is satellite spatter? - Ans small droplets of blood broken from the main drop
The size of a blood droplet is dependent on what? - Ans volume and velocity
What is low velocity spatter? - Ans -spatter that is 3mm or greater in diameter
-this type of spatter is usually causes blood to fall under the influence of gravity
-usually forms from weapon cast-off, a person remaining still, walking, or running
What is medium velocity spatter? - Ans -spatter the is 1-3mm in diameter
-usually forms from blunt force trauma, sharp trauma, or cast-off
What is high velocity spatter? - Ans -spatter that is less than 1mm in diameter
-appears as a fine spray or misting
-usually forms from gunshot trauma, power tools, an object striking with extreme velocity, or an
explosion
What is impact/forward spatter? - Ans blood displaced by energetic impact
What is a cast-off pattern? - Ans when blood is released or thrown from a blood-bearing
object in motion
,What can you tell from cast-off? - Ans -speed
-size of object
-number of swings
What is a projected pattern? - Ans when blood exits the body under pressure from a breached
artery
What is expirated blood? - Ans blood that is blown out of the mouth, nose, or a would. It is
often diluted or contains mucous.
What is the area of convergence? - Ans When you draw a straight line through the back of
blood stains and where the lines intersect is the area of convergence
How do you tell the direction of a blood stain? - Ans the tail (pointy part) tells which way the
bloodstain goes
What is a void? - Ans an absence of blood
What shows that the crime scene has not been disturbed? - Ans -bubble rings
-drips
-saturation
What can show the order of things that happened at a crime scene? - Ans -flow
-pattern transfer
-skeletonization
-swipes
-wipes
, -insect artifact
What are bubble rings? - Ans when blood containing air bubbles dries (shows that the blood is
older and not disturbed)
What is a flow pattern? - Ans the motion of blood under gravity (if an object has been moved
then the flow pattern should look a little weird)
What is a drip pattern? - Ans when blood drips into other blood (there should be lots of
satellite spatter)
This shows that the crime scene has not been disturbed
What is a saturation stain? - Ans a large volume of absorbed blood
What is a wipe pattern? - Ans when an object moves through an existing stain
What is a swipe pattern? - Ans the transfer of blood from a dirty source onto a clean source
What is a skeletonized stain? - Ans the pattern left when an object moves through a partially
dried stain, removing part of the blood, but leaving the outline of the stain intact
When is trace evidence formed? - Ans generated when objects touch each other and remains
of material are left behind
What is a latent print processor? - Ans -they locate and develop fingerprints and may handle
database entry
-chemistry and lab training needed
COMPLIED WITH COMPLETE SOLUTION RATED A+ NEW
EDITION 2026
What are the requirement for a bloodstain pattern analyst? - Ans -no formal education
requirements
-certification through IAI and American Criminalistics Society
What are the 4 phases of stain creation? - Ans -contact/collapse
-displacement
-dispersion
-retraction
What is a bloodstain pattern? - Ans grouping or distribution of bloodstains that indicates the
manner in which the pattern was deposited
What two parts is blood compromised of? - Ans -hematocrit
-plasma
What happens in the contact/collapse stage of impact? - Ans Blood droplet his the object and
collapses from the bottom up
What happens in the displacement stage of impact? - Ans slight dimples and spines begin to
form around the edge of the drop
,What happens in the dispersion stage of impact? - Ans most of the volume of blood is forced
up and out so the spines are extended outward
What happens in the retraction stage of impact? - Ans surface tension pulls the drop flat and
the satellites with enough momentum break free
What is satellite spatter? - Ans small droplets of blood broken from the main drop
The size of a blood droplet is dependent on what? - Ans volume and velocity
What is low velocity spatter? - Ans -spatter that is 3mm or greater in diameter
-this type of spatter is usually causes blood to fall under the influence of gravity
-usually forms from weapon cast-off, a person remaining still, walking, or running
What is medium velocity spatter? - Ans -spatter the is 1-3mm in diameter
-usually forms from blunt force trauma, sharp trauma, or cast-off
What is high velocity spatter? - Ans -spatter that is less than 1mm in diameter
-appears as a fine spray or misting
-usually forms from gunshot trauma, power tools, an object striking with extreme velocity, or an
explosion
What is impact/forward spatter? - Ans blood displaced by energetic impact
What is a cast-off pattern? - Ans when blood is released or thrown from a blood-bearing
object in motion
,What can you tell from cast-off? - Ans -speed
-size of object
-number of swings
What is a projected pattern? - Ans when blood exits the body under pressure from a breached
artery
What is expirated blood? - Ans blood that is blown out of the mouth, nose, or a would. It is
often diluted or contains mucous.
What is the area of convergence? - Ans When you draw a straight line through the back of
blood stains and where the lines intersect is the area of convergence
How do you tell the direction of a blood stain? - Ans the tail (pointy part) tells which way the
bloodstain goes
What is a void? - Ans an absence of blood
What shows that the crime scene has not been disturbed? - Ans -bubble rings
-drips
-saturation
What can show the order of things that happened at a crime scene? - Ans -flow
-pattern transfer
-skeletonization
-swipes
-wipes
, -insect artifact
What are bubble rings? - Ans when blood containing air bubbles dries (shows that the blood is
older and not disturbed)
What is a flow pattern? - Ans the motion of blood under gravity (if an object has been moved
then the flow pattern should look a little weird)
What is a drip pattern? - Ans when blood drips into other blood (there should be lots of
satellite spatter)
This shows that the crime scene has not been disturbed
What is a saturation stain? - Ans a large volume of absorbed blood
What is a wipe pattern? - Ans when an object moves through an existing stain
What is a swipe pattern? - Ans the transfer of blood from a dirty source onto a clean source
What is a skeletonized stain? - Ans the pattern left when an object moves through a partially
dried stain, removing part of the blood, but leaving the outline of the stain intact
When is trace evidence formed? - Ans generated when objects touch each other and remains
of material are left behind
What is a latent print processor? - Ans -they locate and develop fingerprints and may handle
database entry
-chemistry and lab training needed
