FIS 409 Exam 2025–2026 Accurate Real Exam
150 Questions and Verified Correct Answers
JUST RELEASED
Which four (4) ways can satellite stains occur in the scene? - answer>>>Attached to
parent
Semi-detached from parent
Detached but in proximity to parent
Detached and disassociated from parent
The coagulation cascade has two initial pathways, which meet and finish the process of
clot production (fibrin clot): the [A] and [B] pathways. - answer>>>intrinsic and extrinsic
pathways
What term defines a bloodstain pattern resulting from blood drops which can be
produced when a projectile creates an exit wound. - answer>>>Forward Spatter Pattern
What is the difference between forward and back spatter? - answer>>>forward spatter
continues with a projectile in the direction of travel while back spatter travels in a
direction opposite the force applied.
The coordinate vectors form ___________ to each other when constructing them based
on the string (in 3D space). - answer>>>90 degree angles
Based on OSAC terminology, the gamma angle is known as the _________________. -
answer>>>directional angle
Briefly list the two lines that you should make to determine gamma on a wall of a
bedroom - answer>>>Through the major axis of the stain and
Through a vertical reference point (straight down)
You determine the alpha angle to be 90 degrees, what is the beta angle? - answer>>>90
degrees
, When there is an impact with a source of blood, the resulting droplet's trajectories will
follow a _______________ path until they impact a target surface. - answer>>>parabolic
or curved
What is the projection for Beta Top? - answer>>>XY
What is the projection for Beta Side? - answer>>>ZX
What is the projection for Beta End? - answer>>>YZ
What is the formula for Beta Top? - answer>>>B = (tan alpha/sin gamma) ^tan-1
What is the formula for Beta Side? - answer>>>B = (tan alpha/cos gamma) ^tan-1
What are the formulas for Beta End (2)? - answer>>>B = gamma + 180 (if between 0-180)
or B = gamma - 180 (if between 180-360)
A droplet's path into the target surface was from right to left, moving upward. In this
case, the gamma angle will be between [A] to [B] degrees (Hint: think quadrants). -
answer>>>270 and 360 degrees
What is the formula for angle of impact? - answer>>>alpha = sin ^-1 (width/length)
With droplets in flight, an increase in velocity will [A] the air resistance and an increase in
surface area will [B] the air resistance. - answer>>>increase, increase
This may be found on a suicide victim's hands/clothing or inside a gun barrel after
discharge (use OSAC) - answer>>>Backspatter pattern
T/F? When determining alpha using a length/width ratio chart, a greater value represents
a more acute angle - answer>>>True
As a general rule, stains that are _____________ should not be used when determining
the area of origin. - answer>>>more circular (65-90 degrees)
Which of the following is/are TRUE regarding double shot impacts?
a. Wounds further away often lead to a more substantial effect
150 Questions and Verified Correct Answers
JUST RELEASED
Which four (4) ways can satellite stains occur in the scene? - answer>>>Attached to
parent
Semi-detached from parent
Detached but in proximity to parent
Detached and disassociated from parent
The coagulation cascade has two initial pathways, which meet and finish the process of
clot production (fibrin clot): the [A] and [B] pathways. - answer>>>intrinsic and extrinsic
pathways
What term defines a bloodstain pattern resulting from blood drops which can be
produced when a projectile creates an exit wound. - answer>>>Forward Spatter Pattern
What is the difference between forward and back spatter? - answer>>>forward spatter
continues with a projectile in the direction of travel while back spatter travels in a
direction opposite the force applied.
The coordinate vectors form ___________ to each other when constructing them based
on the string (in 3D space). - answer>>>90 degree angles
Based on OSAC terminology, the gamma angle is known as the _________________. -
answer>>>directional angle
Briefly list the two lines that you should make to determine gamma on a wall of a
bedroom - answer>>>Through the major axis of the stain and
Through a vertical reference point (straight down)
You determine the alpha angle to be 90 degrees, what is the beta angle? - answer>>>90
degrees
, When there is an impact with a source of blood, the resulting droplet's trajectories will
follow a _______________ path until they impact a target surface. - answer>>>parabolic
or curved
What is the projection for Beta Top? - answer>>>XY
What is the projection for Beta Side? - answer>>>ZX
What is the projection for Beta End? - answer>>>YZ
What is the formula for Beta Top? - answer>>>B = (tan alpha/sin gamma) ^tan-1
What is the formula for Beta Side? - answer>>>B = (tan alpha/cos gamma) ^tan-1
What are the formulas for Beta End (2)? - answer>>>B = gamma + 180 (if between 0-180)
or B = gamma - 180 (if between 180-360)
A droplet's path into the target surface was from right to left, moving upward. In this
case, the gamma angle will be between [A] to [B] degrees (Hint: think quadrants). -
answer>>>270 and 360 degrees
What is the formula for angle of impact? - answer>>>alpha = sin ^-1 (width/length)
With droplets in flight, an increase in velocity will [A] the air resistance and an increase in
surface area will [B] the air resistance. - answer>>>increase, increase
This may be found on a suicide victim's hands/clothing or inside a gun barrel after
discharge (use OSAC) - answer>>>Backspatter pattern
T/F? When determining alpha using a length/width ratio chart, a greater value represents
a more acute angle - answer>>>True
As a general rule, stains that are _____________ should not be used when determining
the area of origin. - answer>>>more circular (65-90 degrees)
Which of the following is/are TRUE regarding double shot impacts?
a. Wounds further away often lead to a more substantial effect
