CSI Flashcards
Types of Forensic Evidence
Blood Bodily Fluids Footwear Paint Tools / Instruments Glass Fibres Fingerprints Firearms DNA Digital Media Hair
Locard’s exchange principle
Every contact leaves a trace
Types of Fingerprints
Visible
Latent
Types of Footwear marks
Impression mark
Surface transfer mark
5 C’s
Confirm - what, where, size, H&S
Clear - non-essential people (record details)
Cordon - Use physical boundaries and tape
Control - Legitimate access only (scene log)
Check - the other 4 actions have been done properly
Initial Considerations
Heath and Safety (yours and others)
Preservation of evidence (unless injuries not compatible with life)
Protecting vulnerable evidence - Secure the scene, minimising disturbance, protect against the elements
Common Approach Path
What route would the suspect have taken, avoid that route. e.g. don’t use the door that the used to escape. Everyone use the same route. Recorded in SPNB
What can the photographs be used for?
To compile a statement
Briefing tool (CSI, Investigation Manager)
Used to show witnesses/suspects/victims
Show to forensic scientists
Rules
Fill the frame
Four corners to make almost a panorama, then long, mid and close for individual items
Take the photographs at the photographers height - room shots
Never delete - the images are numbered so it might look like you’ve hidden things
If you think it is relevant, take a photograph
Health and Safety
Must overlap
No personnel or equipment in photographs
What to photograph at an RTC
Any road signs Any tyre marks Any clear faults with the car Any documentation - FMT 600 Anything that you believe is relevant - what was in front and behind the car from drivers height
What to photograph in a Building
4 x corners overlapping
Name or number of building
Doorways and corridors - portrait
What is required?
Exhibit Sketch Plan
Title & Exhibit - Exhibit SC/1 - Sketch Plan of... Date & time compiled. Compiled by... Signed NOT TO SCLAE Pen NOT pencil No common approach path on the exhibit Can be done on the computer and printed
Cross Contamination
Introducing something that wasn’t originally there.
Trace evidence added/moved/monitored/altered after the crime is committed.
Caused - Inappropriate Practices, Investigator Transfer, Incorrect or poor packaging
Anti-Contamination Strategy
Staff Deployment Scene cordon & Entry Scene Movement Detection Animals Equipment PPE
Volume Crime PPE
2 pairs of gloves
Face mask
Scene Preservation - MARAD
Must not compromise a scene by the material being: Lost Moved Added Removed Altered Destroyed
Principles of Packaging
Preservation
Isolation
Correct & Clear Labelling
Security
Packaging Considerations
PIC
Container used
Wet Articles
Exhibit Continuity - take ownership of your exhibits, sign for them
Packaging and Handling
Integrity
Continuity
Clothing - TWAT
You want to recover the clothing as quickly as possible
Time - amount of time between transfer and recovers
Washing - the amount of times it has been washed since
Activity - What activity - e.g. running/how much wear etc
Texture - Type or garment (woollen jumper/leather)
What are they types of transfer?
One way Two way Random Specific Secondary
Health and Safety
PPE
Was hands after handling exhibits
Keep areas clean
Never smoke
