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 pa ern analyst? - Ans -no formal educa on
requirements
-cer fica on through IAI and American Criminalis cs Society
What are the 4 phases of stain crea on? - Ans -contact/collapse
-displacement
-dispersion
-retrac on
What is a bloodstain pa ern? - Ans grouping or distribu on of bloodstains that indicates the
manner in which the pa ern 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 bo om 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 retrac on stage of impact? - Ans surface tension pulls the drop flat and
the satellites with enough momentum break free
What is satellite spa er? - 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 spa er? - Ans -spa er that is 3mm or greater in diameter
-this type of spa er is usually causes blood to fall under the influence of gravity
-usually forms from weapon cast-off, a person remaining s ll, walking, or running
What is medium velocity spa er? - Ans -spa er the is 1-3mm in diameter
-usually forms from blunt force trauma, sharp trauma, or cast-off
What is high velocity spa er? - Ans -spa er that is less than 1mm in diameter
-appears as a fine spray or mis ng
-usually forms from gunshot trauma, power tools, an object striking with extreme velocity, or an
explosion
What is impact/forward spa er? - Ans blood displaced by energe c impact
What is a cast-off pa ern? - Ans when blood is released or thrown from a blood-bearing
object in mo on
,What can you tell from cast-off? - Ans -speed
-size of object
-number of swings
What is a projected pa ern? - 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
o0en 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 direc on 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
-satura on
What can show the order of things that happened at a crime scene? - Ans -flow
-pa ern transfer
-skeletoniza on
-swipes
-wipes
, -insect ar fact
What are bubble rings? - Ans when blood containing air bubbles dries (shows that the blood is
older and not disturbed)
What is a flow pa ern? - Ans the mo on of blood under gravity (if an object has been moved
then the flow pa ern should look a li le weird)
What is a drip pa ern? - Ans when blood drips into other blood (there should be lots of
satellite spa er)
This shows that the crime scene has not been disturbed
What is a satura on stain? - Ans a large volume of absorbed blood
What is a wipe pa ern? - Ans when an object moves through an exis ng stain
What is a swipe pa ern? - Ans the transfer of blood from a dirty source onto a clean source
What is a skeletonized stain? - Ans the pa ern le0 when an object moves through a par ally
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 le0 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 pa ern analyst? - Ans -no formal educa on
requirements
-cer fica on through IAI and American Criminalis cs Society
What are the 4 phases of stain crea on? - Ans -contact/collapse
-displacement
-dispersion
-retrac on
What is a bloodstain pa ern? - Ans grouping or distribu on of bloodstains that indicates the
manner in which the pa ern 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 bo om 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 retrac on stage of impact? - Ans surface tension pulls the drop flat and
the satellites with enough momentum break free
What is satellite spa er? - 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 spa er? - Ans -spa er that is 3mm or greater in diameter
-this type of spa er is usually causes blood to fall under the influence of gravity
-usually forms from weapon cast-off, a person remaining s ll, walking, or running
What is medium velocity spa er? - Ans -spa er the is 1-3mm in diameter
-usually forms from blunt force trauma, sharp trauma, or cast-off
What is high velocity spa er? - Ans -spa er that is less than 1mm in diameter
-appears as a fine spray or mis ng
-usually forms from gunshot trauma, power tools, an object striking with extreme velocity, or an
explosion
What is impact/forward spa er? - Ans blood displaced by energe c impact
What is a cast-off pa ern? - Ans when blood is released or thrown from a blood-bearing
object in mo on
,What can you tell from cast-off? - Ans -speed
-size of object
-number of swings
What is a projected pa ern? - 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
o0en 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 direc on 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
-satura on
What can show the order of things that happened at a crime scene? - Ans -flow
-pa ern transfer
-skeletoniza on
-swipes
-wipes
, -insect ar fact
What are bubble rings? - Ans when blood containing air bubbles dries (shows that the blood is
older and not disturbed)
What is a flow pa ern? - Ans the mo on of blood under gravity (if an object has been moved
then the flow pa ern should look a li le weird)
What is a drip pa ern? - Ans when blood drips into other blood (there should be lots of
satellite spa er)
This shows that the crime scene has not been disturbed
What is a satura on stain? - Ans a large volume of absorbed blood
What is a wipe pa ern? - Ans when an object moves through an exis ng stain
What is a swipe pa ern? - Ans the transfer of blood from a dirty source onto a clean source
What is a skeletonized stain? - Ans the pa ern le0 when an object moves through a par ally
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 le0 behind
What is a latent print processor? - Ans -they locate and develop fingerprints and may handle
database entry
-chemistry and lab training needed
