FKA 3 Flashcards
When processing the scene of a death, what are some considerations prior to moving the body
1) photograph the body in situ
2) examine body visually
3) examined with forensic Lightsource
4) use bags on the hands, feet and head
5) Collect fragile evidence
Name the common bio-hazards associated with violent crime or death scenes as well as which arti-facts at the scene present bio-hazards
1) blood
2) urine
3) feces
4) saliva
5) vomit
6) infectious disease (HIV, hepatits, etc)
What is Adipocere
A gray – white coloured wax like substance as a result of decomposition of fatty tissue in deceased bodies caused by the hydrolysis of lipids. Occurs as early as two weeks or as late as two months post death, with variables such as temperature/weather, items around the body (plastic) and/or burial/embalming methods
What is forensic odontology
The use of dental knowledge in identifying bite marks and unknown human remains. Teeth and bite marks are unique and therefore identifiable and can be compared against dental records or a test impression can be obtained from the subject
In nanometers, what is the wavelength of the visible portion of the electromagnetic spectrum
400-700 Nanometers
The term luminescence is a general term that incorporates various phenomena including thermoluminescence, bio luminescence, chemical luminesence Which in turn includes fluorescence and phosphorescence. Briefly describe what each term means
Thermoluminescence; light admission from absorption of light energy
Bio luminescence; light admission from a biological process
Chemical luminescence; light emission from a chemical process
Photoluminescence; light emission from absorption of light energy
- florescence; light emitted during excitation
- phosphorescence; light emitted after excitation
During the process of qualifying yourself as an expert in court defence counsel asks are you an expert in the location, development, collection, analysis and identification of fingerprints. How would you answer this?
A Courr designates who an expert is or deems a person to be an expert. However, specifically in the area of collection of evidence, through training and operational files, I have gained the knowledge ability and experience to complete an accurate and complete assessment of the evidence and provide an accurate an opinion and therefore yes I am an expert in this field.
Often forensic identification personnel will make reference in the reports or during testimony to unsuitable friction Ridge impressions. During cross-examination, defence counsel asked you to clarify the expression for the court and describe what a suitable impression is. How would you clarify the expression to the court in order to reflect your impartiality
That there was sufficient information in quantity and quality to identify to a known source or to exclude
What does AFIS acconym stand for
Automated fingerprint identification system
How are latent fingerprints or physical evidence, developed at a crime scene, to be marked prior to photographing and lifting
1) circle the impression
2) assign an R or F number
3) dial number
4) date
5) initials
6) orientation - arrow (if applicable)
It is likely that the ridge detail of a fingerprint which has been developed with chemistry powder can be further enhance by the application of lightning gray powder. What about the reverse?
Yes, it can work both ways. Best success with a first application of silver powder, photograph and lift the impression, use a guttural breath on the impression, then develop with chemistry powder, photograph and lift again
What method would you use to develop/enhance a fingerprint on a waxy or a oily surface
1) florescence examination
2) Sudan black
3) cyanoacrylate
4) Chemist gray powder
List 2 recommended methods of developing/enhancing latent fingerprints on plastic bags
1) cyanoacrylate, view with white light and further process with fluorescent dye stains if applicable
2) Vacuum metal deposition
If silver gray fingerprint powder is used to examine a black, plastic cash register tray, what will probably happen to the fingerprint powder when it applied
The impression will over develop and/or fill in
List two recommended methods of lifting a finger print from a very rough surface or oddly shaped surface
1) gel/rubber lifter
2) impression moulding materials
- White school style glue
- Coe-flex
Where will you locate the recommended formula for preparing ninhydrin working solution
1) recipe book for chemical solutions located in the FIS office
2) Q-Pulse; search for ninhydrin working solution
3) copy of recipes received from the Canadian police college
Which technique is recommended for developing fingerprints on wet or damp, non-porous surfaces
Small particle reagent
How can you intensify a week fingerprint developed with magna fingerprint powder
1) guttural breath
2) chemicals (ninyhdrin/DFO)
Describe the cyanoacrylate fingerprint development process
Occurs in a sealed chamber in which moisture is introduced creating humidity. Cyanoacrylate is heated on an element causing it to evaporate and as a result this bapor of water/cyanoacrylate polymerizes on the sweat/sebaceous oils and appear as white friction ridges. Post processing, dye stains can be used to enhance impression further and subsequently view them with the appropriate alternate light source for the dye being used
Name five different chemical reagents that could be used to enhance fingerprints and blood
1) Amido black
2) aqueous Leuco crystal violet ALCV
3) brilliant blue
4) acid yellow 7
5) acid violet 17
How would you enhance a friction ridge impression, believed to be blood, on a dark colored, nonporous surface
1) fluorescent light source
2) coloured development powders
3) vacuum metal deposition chamber
4) Chemicals (acid yellow and violet)
5) Cyanoacrylate
Will cyanoacrylate fuming interfere with acid yellow seven an acid violet 17 development of a bloody impression on a nonporous surface
Yes
Explain the proper procedure to conduct a presumptive test of a stain, suspected to be blood, using a hemastix and what precautions should be taken
Indirect test. Sterile swab. Drip sterile water on swab. Suave a small area of the steam away from the main/Central perk of stain. Place swab on hemastix. Note result. If swab is taken subsequently, note on the envelope that indirect hemastix test was conducted. New gloves should be worn between each swab and examiner should wear a mask.
What are the three main categories of bloodstains encountered a crime scenes
1) gravity
2) Spatter
3) Transfer
