IAI CSI Certification questions with verified answers
1:1 magnification ratio Ans✓✓✓ item of evidence is life-size on sensor;
appropriate for photographing latent prints
18% gray card Ans✓✓✓ card used to determine proper exposure when
encountering a "non-normal" lighting condition; can also used well traveled
asphalt or green grass
2 basic observations of presumptive death Ans✓✓✓ 1) trauma inconsistent with
life
2) absence of normal life signs
4r rule Ans✓✓✓ ridge lines on radial fractures occur at right angles to the rear
aberrations Ans✓✓✓ defects in an image produced by the lens, typically occur at
the widest aperture
absorbed ultraviolet light Ans✓✓✓ bloodstains will absorb UV light, making them
contrast with surfaces similar in color to blood
acutance Ans✓✓✓ clear and precise distinction between edge of object and
substrate on which it sits
AFIS Ans✓✓✓ Automated Fingerprint Identification System; computer database
of recorded prints used to compare latent prints
,algor mortis Ans✓✓✓ loss of body heat, highly variable
amido black Ans✓✓✓ protein stain, can be water based or methanol based
angle of impact (non tumbling) Ans✓✓✓ inverse SINE of the minor axis
(width)/major axis(length)
aperture Ans✓✓✓ refers to opening created by diaphragm; controls depth of
field
aperture priority exposure mode Ans✓✓✓ photographer determines desired
aperture, camera determines appropriate shutter speed based on lighting
conditions
APS-C digital sensors Ans✓✓✓ sensors smaller than original film negative size,
resulting in "cropped" view compared to film counterpart of that size
area of origin of bloodstain Ans✓✓✓ the impact and directional angles from a
number of stains from same impact event can be used to determine the origin of
the stains in 3D
asphyxia Ans✓✓✓ trauma from lack of oxygen
barrel Ans✓✓✓ tubular portion of firearm that directs the projectile when fired
barrel distortion Ans✓✓✓ straight lines near edge of image appear to bend; issue
with wide angle lenses
, baseline coordinates Ans✓✓✓ arbitrary (but straight) baseline established, and
evidence fixed on baseline
basic activities of scene processing Ans✓✓✓ assessing, observing, documenting,
searching, collecting, analyzing
basic elements of a sketch Ans✓✓✓ heading, diagram area, legend, title block,
scale and direction notations
basic types of surfaces Ans✓✓✓ porous, nonporous smooth, nonporous rough,
special conditions
blood accumulating/flowing on surface Ans✓✓✓ regular margins, like pool of
water; flows, pools, saturations
blood dispersed due to secondary contact with surface Ans✓✓✓ pattern
transfers; smears/wipes/swipes
blood dispersed via gravity Ans✓✓✓ drip, drip trails, or blood in to blood
(circular with some satellites)
blood dispersed with accelerated motion Ans✓✓✓ small jet, called cast off
(linear)
1:1 magnification ratio Ans✓✓✓ item of evidence is life-size on sensor;
appropriate for photographing latent prints
18% gray card Ans✓✓✓ card used to determine proper exposure when
encountering a "non-normal" lighting condition; can also used well traveled
asphalt or green grass
2 basic observations of presumptive death Ans✓✓✓ 1) trauma inconsistent with
life
2) absence of normal life signs
4r rule Ans✓✓✓ ridge lines on radial fractures occur at right angles to the rear
aberrations Ans✓✓✓ defects in an image produced by the lens, typically occur at
the widest aperture
absorbed ultraviolet light Ans✓✓✓ bloodstains will absorb UV light, making them
contrast with surfaces similar in color to blood
acutance Ans✓✓✓ clear and precise distinction between edge of object and
substrate on which it sits
AFIS Ans✓✓✓ Automated Fingerprint Identification System; computer database
of recorded prints used to compare latent prints
,algor mortis Ans✓✓✓ loss of body heat, highly variable
amido black Ans✓✓✓ protein stain, can be water based or methanol based
angle of impact (non tumbling) Ans✓✓✓ inverse SINE of the minor axis
(width)/major axis(length)
aperture Ans✓✓✓ refers to opening created by diaphragm; controls depth of
field
aperture priority exposure mode Ans✓✓✓ photographer determines desired
aperture, camera determines appropriate shutter speed based on lighting
conditions
APS-C digital sensors Ans✓✓✓ sensors smaller than original film negative size,
resulting in "cropped" view compared to film counterpart of that size
area of origin of bloodstain Ans✓✓✓ the impact and directional angles from a
number of stains from same impact event can be used to determine the origin of
the stains in 3D
asphyxia Ans✓✓✓ trauma from lack of oxygen
barrel Ans✓✓✓ tubular portion of firearm that directs the projectile when fired
barrel distortion Ans✓✓✓ straight lines near edge of image appear to bend; issue
with wide angle lenses
, baseline coordinates Ans✓✓✓ arbitrary (but straight) baseline established, and
evidence fixed on baseline
basic activities of scene processing Ans✓✓✓ assessing, observing, documenting,
searching, collecting, analyzing
basic elements of a sketch Ans✓✓✓ heading, diagram area, legend, title block,
scale and direction notations
basic types of surfaces Ans✓✓✓ porous, nonporous smooth, nonporous rough,
special conditions
blood accumulating/flowing on surface Ans✓✓✓ regular margins, like pool of
water; flows, pools, saturations
blood dispersed due to secondary contact with surface Ans✓✓✓ pattern
transfers; smears/wipes/swipes
blood dispersed via gravity Ans✓✓✓ drip, drip trails, or blood in to blood
(circular with some satellites)
blood dispersed with accelerated motion Ans✓✓✓ small jet, called cast off
(linear)
