FIS 201 EXAM 3 MOHR | 176 QUESTIONS AND
ANSWERS | 2025/2026 UPDATE | WITH COMPLETE
SOLUTION!!
What are the requirement for a bloodstain pattern analyst? Answer - -no
formal education requirements
-certification through IAI and American Criminalistics Society
What are the 4 phases of stain creation? Answer - -contact/collapse
-displacement
-dispersion
-retraction
What is a bloodstain pattern? Answer - grouping or distribution of bloodstains
that indicates the manner in which the pattern was deposited
What two parts is blood compromised of? Answer - -hematocrit
-plasma
What happens in the contact/collapse stage of impact? Answer - Blood droplet
his the object and collapses from the bottom up
What happens in the displacement stage of impact? Answer - slight dimples
and spines begin to form around the edge of the drop
,What happens in the dispersion stage of impact? Answer - 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? Answer - surface tension pulls
the drop flat and the satellites with enough momentum break free
What is satellite spatter? Answer - small droplets of blood broken from the
main drop
The size of a blood droplet is dependent on what? Answer - volume and
velocity
What is low velocity spatter? Answer - -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? Answer - -spatter the is 1-3mm in diameter
-usually forms from blunt force trauma, sharp trauma, or cast-off
What is high velocity spatter? Answer - -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? Answer - blood displaced by energetic impact
, What is a cast-off pattern? Answer - when blood is released or thrown from a
blood-bearing object in motion
What can you tell from cast-off? Answer - -speed
-size of object
-number of swings
What is a projected pattern? Answer - when blood exits the body under
pressure from a breached artery
What is expirated blood? Answer - 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? Answer - 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? Answer - the tail (pointy part)
tells which way the bloodstain goes
What is a void? Answer - an absence of blood
What shows that the crime scene has not been disturbed? Answer - -bubble
rings
-drips
-saturation
ANSWERS | 2025/2026 UPDATE | WITH COMPLETE
SOLUTION!!
What are the requirement for a bloodstain pattern analyst? Answer - -no
formal education requirements
-certification through IAI and American Criminalistics Society
What are the 4 phases of stain creation? Answer - -contact/collapse
-displacement
-dispersion
-retraction
What is a bloodstain pattern? Answer - grouping or distribution of bloodstains
that indicates the manner in which the pattern was deposited
What two parts is blood compromised of? Answer - -hematocrit
-plasma
What happens in the contact/collapse stage of impact? Answer - Blood droplet
his the object and collapses from the bottom up
What happens in the displacement stage of impact? Answer - slight dimples
and spines begin to form around the edge of the drop
,What happens in the dispersion stage of impact? Answer - 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? Answer - surface tension pulls
the drop flat and the satellites with enough momentum break free
What is satellite spatter? Answer - small droplets of blood broken from the
main drop
The size of a blood droplet is dependent on what? Answer - volume and
velocity
What is low velocity spatter? Answer - -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? Answer - -spatter the is 1-3mm in diameter
-usually forms from blunt force trauma, sharp trauma, or cast-off
What is high velocity spatter? Answer - -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? Answer - blood displaced by energetic impact
, What is a cast-off pattern? Answer - when blood is released or thrown from a
blood-bearing object in motion
What can you tell from cast-off? Answer - -speed
-size of object
-number of swings
What is a projected pattern? Answer - when blood exits the body under
pressure from a breached artery
What is expirated blood? Answer - 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? Answer - 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? Answer - the tail (pointy part)
tells which way the bloodstain goes
What is a void? Answer - an absence of blood
What shows that the crime scene has not been disturbed? Answer - -bubble
rings
-drips
-saturation
