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CSI (3rd year) > Crime Scene processing > Flashcards

Crime Scene processing Flashcards

1
Q

what does ALS stand for

A

alternate light source

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2
Q

what does FLS stand for

A

forensic light source

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3
Q

how long have ALS and FLS been in use for

A

over 40 years

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4
Q

true/false most ALS and FLS light sources are portable

A

true

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5
Q

what are 4 examples of what ALS/FLS can detect

A
  • fingerprints
  • fibres
  • hair
  • human body fluids
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6
Q

are ALS/FLS search results presumptive

A

yes

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7
Q

true/false ALS/FLS are straight forward process to search and photograph

A

true

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8
Q

how should you find the best wavelength setting for the ALS unit

A

trial and error

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9
Q

what is different about searching with ALS

A
  • search the scene first with ALS
  • locate/note items or areas of interest
  • need to wear goggles (typically red and yellow)
  • then setup camera for photos
  • use the same colour filter as the goggles you’re wearing
  • use a tripod, but no flash
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10
Q

what camera settings are needed for ALS/FLS

A
  • orange filter on lens
  • high depth of field
  • low ISO
  • times exposure
  • use remote shutter release cord (trial and error to figure out timing)
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11
Q

what provides an overview of the collection and packaging requirements for items being submitted to the CFS

A

the handbook of forensic evidence for the investigator

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12
Q

what is a secondary offence

A
  • an offence that may be/is prosecuted by way of indictment for which the max punishment is 5 years or more of imprisonmen
  • theses are other than primary offences
  • extensive list of offences
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13
Q

when DNA is taken from a suspect, where is it sent

A

RCMP

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14
Q

what are the different swab classifications for submission to CFS

A
  1. swabs of suspected blood
  2. swabs of drink containers/ drinking implements
  3. swabs of partially eaten food/ eating utensils
  4. other “saliva” swabs
  5. weapon swabs (guns and knives only)
  6. airbag swabs
  7. “other” swabs
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15
Q

what does BLS stand for (Swab Classification for Submission to CFS)

A

swabs of suspected blood

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16
Q

what does DCS stand for (Swab Classification for Submission to CFS)

A

Swabs of drink containers /drinking implements

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17
Q

what does FDS stand for (Swab Classification for Submission to CFS)

A

Swabs of partially eaten food / eating utensils

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18
Q

what does SAS stand for (Swab Classification for Submission to CFS)

A

Other ‘saliva’ swabs

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19
Q

what does WPS stand for (Swab Classification for Submission to CFS)

A

Weapon swabs (Guns and Knives only)

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20
Q

what does ABS stand for (Swab Classification for Submission to CFS)

A

Airbag swabs

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21
Q

what does OTH stand for (Swab Classification for Submission to CFS)

A

‘Other’ swabs

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22
Q

how should you swab blood if its dry

A

use a moistened swab with distilled water

23
Q

how should you swab blood if its wet

A

use a dry swab

24
Q

how saturated should be a blood swab be

A

don’t oversaturate it (can inhibit the ability to find DNA

25
Q

true/false the CFS want negative control samples

A
  • False
  • They were not needed as DNA testing had become more sensitive
  • as of april 20 2017
26
Q

how should you swab a drink container (DCS)

A
  • only swab if they appear to have been used for their stated purpose within the time frame of the relevant offence
  • moistened swab
27
Q

how should you swab Utensils and Partially Eaten Food (FDS)

A

moistened swab

28
Q

what is included in items you might swab for Saliva Swabs (SAS)

A
  • lipsticks
  • drug pipes
  • suspected spit
  • plastic cigarillo tips
  • cigars
  • All other items that may have come into contact with saliva and/or nasal secretions
29
Q

what is the requirement for swabbing weapons (WPS)

A

Handled weapons must have been brought to the scene by perpetrators during the commission of an offence

30
Q

what should you swap with air bags (ABS)

A

Swab of each deployed air bag and a separate swab of any other visible mucous or blood like stains

31
Q

true/false results of an ABS swab can position occupants in a particular seat in the vehicie

A

false

32
Q

if you swab blood from an air bag, which code should it go under

A

ABS

33
Q

where are DNA profiles submitted to

A

NDDB run by the RCMP

34
Q

what does NDDB stand for

A

national dna databank

35
Q

how does the NDDb assist law enforcements

A

1) Linking crimes together where there are no suspects;
2) Helping to identify suspects;
3) Eliminating suspects where there is no match between crime scene DNA and a DNA profile in the National DNA Data Bank; and,
4) Determining whether a serial offender is involved

36
Q

true/false biological samples collected from convicted offenders and the resulting DNA profiles can only be used for law enforcement purposes

A

true

37
Q

what act states that biological samples collected from convicted offenders and the resulting DNA profiles can only be used for law enforcement purposes

A

DNA identification act

38
Q

what are the 2 main indices of the NDDB

A
  • convicted offender index
  • crime scene index
39
Q

what is found in the COI

A

DNA profiles collected from offenders convicted of designated primary and secondary offences

40
Q

what is found in the CSI

A

DNA profiles obtained from crime scene investigations

41
Q

what is the american version of NDDB

A
  • CODIS run by the FBI
  • combined DNA index system
42
Q

what are the 3 indices in CODIS

A
  • forensic
  • offender
  • arrestee
43
Q

what does CODIS allow for

A

Allows federal, state, and local crime laboratories to exchange and compare DNA profiles

44
Q

how many profiles from those convicted are found in CODIS’ offender index

A

more than 18 million

45
Q

what is the UK’s version of the NDDb

A

National DNA database
(same thing but maybe not an acronym?)

46
Q

what was the world’s first national database

A

the united kingdom’s national dna database

47
Q

how many DNA samples are found in the united kingdom’s national dna database

A

from 2.7 million individuals (about 5.2% of the population)

48
Q

can DNA be collected on arrest for the united kingdom’s national dna database

A
  • yes, as of 2004 it can be arrest rather than charge
  • in england and wales, not scotland
49
Q

how many profiles does the united kingdom’s national dna database have

A

more than 4 million

50
Q

what is interpol’s version of the NDDb

A

DNA gateway

51
Q

what profiles can be found under the interpol DNA gateway

A
  • offenders
  • crime scene
  • missing persons
  • unidentified remains
52
Q

how many profiles are there in the interpol DNA gateway

A

> 280 000 profiles from 87 countries

53
Q
A

CSI (3rd year) (9 decks)

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