COMPLETE SOLUTIONS VERIFIED
Locard's Exchange Principle
- Every contact leaves a trace
- Dr. Edmond Locard, Lyon France
what is a crime scene?
any physical scene that may provide evidence of a crime
i.e. vehicles, buildings, human bodies, open-air sites, water locations
what is crime scene evdence?
physical items (exhibits) recovered at or in relation to a crime scene
Brenda Waudby
- wrongfully convicted of murdering her daughter
- evidence from autopsy (hair) was retained by Dr. Charles Smith and not submitted for
DNA testing (PTBO 1997)
Paul Bernardo and Karla Homolka
- St. Cathrines 1993
- "missed" videotapes in search of house lead to karla's 12 yr sentence
crime-scene investigation
- attempts to generate investigative leads through identification of evidence to
individuals
-requires ability to recognize and properly collect evidence
-should determine full extent of crime scene to establish boundaries
,crime scene examiners
- record, document and examine scene
- collect and preserve evidence
- submit evidence for further exam/processing
- testify in court
CSI
crime scene investigator
FIO
forensic identification officer
FIA
forensic identification assistant
SOCO
scenes of crime officer
FSA
forensic services assistant
SCS
scenes of crime specialist
CSST
crime scene support technician
Scene photos
general-photos taken of the scene prior to processing
exhibit photos
, - specific set of photos of evidence
- consists of 4: overview, midrange, close up, close up w scale
crime scene photos
- record the area in which the crime took place, and all other areas of importance to the
scene
- photos should be taken prior to scene processing
digital photography
made when a light sensitive microchip (sensor) captures light on ea of millions of tiny
picture element (pixels)
Charge-couples device (CCD)
- digital equivalence of film
JPEG
Joint Photographic Experts Group
tiff
Tagged Image File Format
raw
propriety format
exposure
amount of light that reaches the camera sensor
too much light (over exposed)
too little light (under exposed)
affected by aperture, shutter speed, and camera ISO
aperture