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FSC100 The Real CSI Final Exam with Complete Solutions
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FSC100 The Real CSI Final Exam with Complete Solutions
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FSC100 The Real CSI Final Exam with Complete Solutionsaccuracy of population frequencies - - ANS-- previous assumptions of frequencies in populations may be wrong - STRs may not be independent
- see certain alleles more often if there's a high number of related individuals
- mistakes can be made when samples are coded into database
analysis - - ANS--suitability of print, clarity of print
- level 1, 2, 3 details needed
- sufficient quality and quantity for comparison will depend on examiner
can DNA individualize? - ANS-no, only fingerprints can
circle/spiral limits - ANS-difficult to stay in a perfect spiral path to ensure nothing is missed
circle/spiral search benefits - ANS-good for locating additional items associated to an existing piece of evidence
typically done indoors - too difficult to do outdoors
comparison - - ANS-- level 1 to level 2 to level 3
- pattern type, ridge flow - does it agree with known?
- minutiae agreement? pore structure agreement?
- exclusions can be made at any step in process
control/known samples include: - ANS-- standard/reference - ex. hair/blood/DNA
- substrate control - ex. oil, carpet
- elimination samples
DNA samples collected form known individuals... - ANS-- with consent, by warrant, or discarded samples
- provide information about potential origins of unknown profile and the comparison profile
- exclude individuals as source of unknown
- unknown profile is uploaded to national DNA databank
do you always have a full DNA profile? - ANS-no, either because of DNA degradation or
too little DNA was recovered
evaluation - - ANS-- if there are unexplained differences, there's an exclusion of known as sample
- when every compared feature is consistent, and enough features when considered as a whole leads to individualization - no standard for how many characteristics need to match
fingerprint residue - ANS-- from eccrine glands (watery sweat)
- from touching areas of body containing apocrine glands (sweat with fats and proteins) before touching an object
- from touching external sources then touching an object
first level of fingerprint detail - ANS-basic fingerprint patterns - arch, whorl, loop, deltas - not sufficient for individual ID
how do you calculate coincidental match probability? - ANS-STR1 X STR2 X STR3 ... XSTR13
(multiply together all of the information you have)
how do you document evidence? - ANS-- case number - item number - location
- name of collector
- date and time of discovery
- date and time of collection
- description of item
how do you ensure standardization with DNA testing? - ANS-repeats are scored the same by everyone
how do you get samples from personal effects? - ANS-from razors, toothbrushes, hair brushes; anything thought to have been used by only one person
how do you maintain security of a crime scene? - ANS-- physical presence of police
- police line tape
- police/evidence tamper-proof security seals
- locks/barriers - evidence logs
- tamper-proof property evidence bags/boxes
how do you prevent contamination? - ANS-- use proper PPE
- clean tools between collection of different samples
- change gloves frequently
- package items separately to avoid cross contamination
how do you seal packaged evidence? - ANS-with tamper-proof tape, then initial the seal
how do you search a crime scene? - ANS-- lane/strip search
- line search
- circle/spiral search
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