Quiz #2 Flashcards
CSI search patterns (6 of them)
Search patterns:
Circle or spiral
Lane or strip
Grid search
Line search
Zone search
Point to point search
Begin at the edge or center of circle
The circle expands to became larger or smaller
WARNINGS:
No definite points of reference
May result in missing evidence
Not recommended for cluttered areas or where large amounts of debris are present
Can use it in: rooms, dive-team,
which of the six (6) search patterns is this?
Circle or spiral:
Freq used by law enforcement
Walk in a line then return a few feet over
Dependant upon natural and artificial lighting
Daytime, good. Nighttime, no good
Can be divided, go back and fourth
If lines are already made (parking lots or intersections) this is a good search
which of the six (6) search patterns is this?
Lane or strip search:
Similar to a lane or strip search
Covers the area more than once
Typically one search is conducted in a 90-degree angle from the first search
Benefits
More thorough than a single lane or strip search
which of the six (6) search patterns is this?
Grid searches
Similar to strip or lane
Searchers go in one direction
Useful for large areas
Useful when a large number of searchers are availables
Recommended – law enforcement officer only
Suspect can be the volunteer and redirect the focus
Lisa underwood used this method
which of the six (6) search patterns is this?
Line searches:
Needed when scenes are very large and neet to be broken down into manageable pieces
Areas are marked in a way which identifies them
Strings,
Letters
Numbers, wooden stakes,
Etc.
which of the six (6) search patterns is this?
Zone searches:
Documentation goes from one piece of evidence to the next
Risks: evidence may be lost or overlooked
This is the one we used
More commonly this is the one we use
We use this when we know that we have a certain piece of evidence, such as knowing a gun is in the car—we want the gun
Allow investigators to keep track of evidence collected
Remember: numbers are used to document, not detail a sequence
which of the six (6) search patterns is this?
Point to point searches:
most common search method:
Point to point searches:
Which search area is needed for large areas?
Zone searches
which search patterns are most affected by natural and artificial light
1) Lane or strip search
2) gr
what are the cautions discussed for point-to-point searches
Risks: evidence may be lost or overlooked
Special considerations when selecting search patterns:
what are the 4 considerations?
Safety of investigators remains the highest priority
Terrain
Search priorities
Weather
What are the three levels that scenes should be examined from?
Remember to examine:
Ground level
Eye level
Above
how does weather work against us in CSI?
How does weather work for us in CSI?
Evidence may be lost or destroyed
Very bad wind
rain washing away blood
Sometimes, it may work for us, such as frozen body and preservation
Presumptive test are ____ specific tests
NOT
A __________ test will provide one of two results:
The samples is definitely not a certain substances
The sample probably is the substance
presumptive test
What are the three (3) cautions for the presumptive test “hemastix?”
May be unreliable in extreme cold
May be sensitive to direct sunlight
False positives / negatives
Which chemical enhancement has been used to detect evidence that has been “cleaned up?”
Liminol and BlueStar
BlueStar:
Brighter more visible reaction
More stable mixture
Less re-application needed
DOES NOT DAMAGE DNA on test
Does BlueStar damage DNA?
NO!
Fingerprints are useful for:
1) Providing the presence of someone at the scene of a crime
Especially beneficial when the suspect denies being at the scene
2) Proving the innocence of a suspect
3) Identifying people, such as the decedent or the suspect
What are the Three main patterns of fingerprints?
1) A
2) W
3) L
1) Arches
2) Whirls
3) Loops
__% of all prints are loops (most common)
__% are whirls
__% are arches
65% of all prints are loops (most common)
30% are whirls
5% are arches
most common print type?
Loops, 65%
An impression of the friction ridges of all or any part of finger
A ______ print s what is left behind when a person touches an item
Regardless of an entire friction ridge is captured
what is this?
A latent print
