CRIME SCENE INVESTIGATION EXAMINATION 2025/2026
QUESTIONS WITH ANSWERS MARKED A+
✔✔Passive stains - ✔✔are created by drips, flows, pools, and saturation stains
✔✔Impact and projected spatter stains - ✔✔result of splashes, cast off, arterial spurt, or
gushing, as well as from the impact itself and expiration
✔✔Splash patterns - ✔✔may indicate movement of a victim after being injuried. They
are created when large columes of blood are falling from a source such as an injury.
✔✔Transfer stain - ✔✔is created when a wet blood surface comes in contact with a
seondary surface. a recongnizable image of all/a portion of the orginal surface may be
observied in the patter. Transfer stains occur from sipes, swipes, transfers, or contacts
✔✔Wipe patterns - ✔✔are observed when a perpetrator attempts to clean up a crime
scene by wiping away blood with a cloth
✔✔Contact stains - ✔✔occur when a bloody fingerprint or shoe print is left at the site of
the attack
✔✔Void pattern - ✔✔is created when n item is removed from the area after bloodstain
spatter has been created
✔✔Skeletonized stains - ✔✔occur when the perimeter of the stain has dried and the
center has flaked away, leaving the visible outer ring
✔✔what can a bloodstain pattern analyst tell you - ✔✔*Position of victim or suspect
*Evidence of a struggle
*Areas where stains are absent
*In line stain patterns created by cast off
*sequence of events
*How many impacts and from what direction
*whether stains or patterns are sonsistent with statements
*May determine information that eliminates other avenues of investigation by identifying
whose blood is where
✔✔Lands and grooves - ✔✔striations when a bullet travels through the barrel of a gun
✔✔Two categories of firearms - ✔✔handguns and long guns
✔✔Ballistics - ✔✔the study of a projectile in motion
, ✔✔Questions a firearms examiner can answer - ✔✔*What type and caliber of weapon
was disccharged?
*What angle and distance was the gun fired?
*what was the sequence of events?
*was the firearm function properly
✔✔Bloodstain pattern analysis is a science because - ✔✔the stains and patterns can
be reporduced under controlled circumstances
✔✔Bullets are generally made from - ✔✔lead, which is a soft heavy metal
✔✔Jacket is usually - ✔✔brass, copper, or an alloy and this keeps the bullet from
jamming, melting, or disintegrating.
✔✔Firearms identification is primarily concern concerned with - ✔✔the determination of
whether a bullet, cartridge casing, or other ammunition was discharged, extracted, or
ejected from a specific firearm.
✔✔Striations - ✔✔scratches created by lands and grooves of the barrel
✔✔Class characteristics of bullets - ✔✔*Caliber
*Number of lands and grooves
*width of lands and grooves
*Degree of twist
*Direction of rifling twist
✔✔Class characteristics of cartridges discharged in guns - ✔✔*Caliber
*Firing pin location
*Relative location of extractor/ejector
*Primer type
*Extractor and ejector marks
*Firing pin size and shape
✔✔Three conclusions the firearms examiner can render concerning the comparison of a
suspect weapon to recovered bullets: - ✔✔1. The bullet was fired by the suspect gun
2. Class characteristics and striations do not match; therefore, the suspect gun is
excluded
3. Class characteristics match, but striations do not; therefore the resuults are
inconclusive.
✔✔After doucmenting the firearms' position do what? - ✔✔examine the firearm for
trace/transfer evidence, such as latent fingerprtins, hair and fiber, toolmarks (defaced
serial numbers, and blood spatter evidence.
QUESTIONS WITH ANSWERS MARKED A+
✔✔Passive stains - ✔✔are created by drips, flows, pools, and saturation stains
✔✔Impact and projected spatter stains - ✔✔result of splashes, cast off, arterial spurt, or
gushing, as well as from the impact itself and expiration
✔✔Splash patterns - ✔✔may indicate movement of a victim after being injuried. They
are created when large columes of blood are falling from a source such as an injury.
✔✔Transfer stain - ✔✔is created when a wet blood surface comes in contact with a
seondary surface. a recongnizable image of all/a portion of the orginal surface may be
observied in the patter. Transfer stains occur from sipes, swipes, transfers, or contacts
✔✔Wipe patterns - ✔✔are observed when a perpetrator attempts to clean up a crime
scene by wiping away blood with a cloth
✔✔Contact stains - ✔✔occur when a bloody fingerprint or shoe print is left at the site of
the attack
✔✔Void pattern - ✔✔is created when n item is removed from the area after bloodstain
spatter has been created
✔✔Skeletonized stains - ✔✔occur when the perimeter of the stain has dried and the
center has flaked away, leaving the visible outer ring
✔✔what can a bloodstain pattern analyst tell you - ✔✔*Position of victim or suspect
*Evidence of a struggle
*Areas where stains are absent
*In line stain patterns created by cast off
*sequence of events
*How many impacts and from what direction
*whether stains or patterns are sonsistent with statements
*May determine information that eliminates other avenues of investigation by identifying
whose blood is where
✔✔Lands and grooves - ✔✔striations when a bullet travels through the barrel of a gun
✔✔Two categories of firearms - ✔✔handguns and long guns
✔✔Ballistics - ✔✔the study of a projectile in motion
, ✔✔Questions a firearms examiner can answer - ✔✔*What type and caliber of weapon
was disccharged?
*What angle and distance was the gun fired?
*what was the sequence of events?
*was the firearm function properly
✔✔Bloodstain pattern analysis is a science because - ✔✔the stains and patterns can
be reporduced under controlled circumstances
✔✔Bullets are generally made from - ✔✔lead, which is a soft heavy metal
✔✔Jacket is usually - ✔✔brass, copper, or an alloy and this keeps the bullet from
jamming, melting, or disintegrating.
✔✔Firearms identification is primarily concern concerned with - ✔✔the determination of
whether a bullet, cartridge casing, or other ammunition was discharged, extracted, or
ejected from a specific firearm.
✔✔Striations - ✔✔scratches created by lands and grooves of the barrel
✔✔Class characteristics of bullets - ✔✔*Caliber
*Number of lands and grooves
*width of lands and grooves
*Degree of twist
*Direction of rifling twist
✔✔Class characteristics of cartridges discharged in guns - ✔✔*Caliber
*Firing pin location
*Relative location of extractor/ejector
*Primer type
*Extractor and ejector marks
*Firing pin size and shape
✔✔Three conclusions the firearms examiner can render concerning the comparison of a
suspect weapon to recovered bullets: - ✔✔1. The bullet was fired by the suspect gun
2. Class characteristics and striations do not match; therefore, the suspect gun is
excluded
3. Class characteristics match, but striations do not; therefore the resuults are
inconclusive.
✔✔After doucmenting the firearms' position do what? - ✔✔examine the firearm for
trace/transfer evidence, such as latent fingerprtins, hair and fiber, toolmarks (defaced
serial numbers, and blood spatter evidence.
