FRSC 1011H Lecture 2: Securing%2F Searching the crime scene and photography 2
Securing/ Searching the Crime Scene and Photography
● A detailed log is kept
● Investigators should NEVER do anything that might alter the crime scene
including smoking, eating, drinking, or littering
Surveying the crime scene
● Primary crime scene
○ The location at which the initial crime occurred
○ Ex the house were the murder occurred
● Secondary crime scene
○ The location at which events after the initial crime occurred
○ Ex the shallow grave in which a victim was buried
● Whether a crime scene is primary or secondary may be inferred by the presence
or absence of specific evidence
Searching the Crime Scene
● Line/strip search pattern
● Grid search pattern
● Spiral search pattern
● Wheel/ray search pattern
● Quadrant/ zone search pattern
● Vehicle searches
● Night searches
Photography
● Photographs taken at a crime scene:
○ Show the layout of the scene
○ Show the position of collected and uncollected evidence
○ Show the point of view of victims, suspects, and witnesses
○ Show the original condition of items of evidence at the scene
Filters
● Barrier filters block one specific wavelength (color) of light from reaching the film
or microchip, making areas of that color appear lighter in the photograph
● Bypass filters allow only a small range of wavelengths of light to reach the filem
or microchip and block all others
Document Summary
Investigators should never do anything that might alter the crime scene including smoking, eating, drinking, or littering. The location at which the initial crime occurred. Ex the house were the murder occurred. The location at which events after the initial crime occurred. Ex the shallow grave in which a victim was buried. Whether a crime scene is primary or secondary may be inferred by the presence or absence of specific evidence. Show the position of collected and uncollected evidence. Show the point of view of victims, suspects, and witnesses. Show the original condition of items of evidence at the scene. Barrier filters block one specific wavelength (color) of light from reaching the film or microchip, making areas of that color appear lighter in the photograph. Bypass filters allow only a small range of wavelengths of light to reach the filem or microchip and block all others.