Initial response and scene security
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Who is called within the three-tiered response:
Police, Emg’s, and the Fire department
T or F: the safety of first responders is paramount
True
What comes after the priority of first responders?
Preservation of life (if the person is not deceased)
What must be first established on a scene?
An inner and outer perimeter, but also a “path of contamination”
Path of Contamination:
Asses boundaries and instructs first responders how to enter and exit the scene. - Least likely to have evidence or to be travelled by suspect and victim.
What is the role of the responding officer?
Ensure safety of first responders. . . - Asses’s scene and secure (path of contamination) - Documentation - Transference of responsibility
What further establishes scene safety?
Looking for immediate threats to first responders - Render scene (see if suspect is on scene)
Lifesaving measures are done once . . .
Scene is deemed safe
Scene security is preserved through . . .
• Phsysical presence • Police line tape -Locks/barriers • method depends • barricades (vehicles) • Methods (scope/location) • Death investigation (tents to conceal death)
What perimeters are there?
Inner and Outer
Inner:
Core area where criminal act occurred
Outer:
Includes probable entry and exit routes - police tape
Rule of thumb:
Designates a large perimeter - Always better to make the Perimeter bigger, and then adjust.
Security log:
Documented notes of all peoples who enter and exit the scene
Who takes care of the security log:
Scene security officer
What does the scene security log contain?
• Name and affiliation • Time and entry • Why their on the scene • Under whose authority
What does the security log ensure?
• Crime scene and evidence • Possible contamination/cross contamination Especially in important cases where crime scene record evidence and analyzed (a lot of time)
What is the process of documentation?
• Entering scene • Observe (take written notes) • Document everything (including info surrounding dispatch and arrival at scene) - Even negative info (mistakes/honest errors disclosed)
T or F: It is also important to document witness statements
True
What causes contamination of evidence?
Human error, and not wearing PPE
What does PPE include?
• Tyvek suits • Disposable shoe covers • Mask/other respiratory protection (covers mouth and nose) • Googles/eye protection • Face shield (prevent droplets of fluid)
Double glove technique:
Wear two purple nitrile gloves on top of one another - Prevents accidental tear and contamination of evidence
T or F: the CSI is one of the first people to arrive at the scene
True
Prelim assessment:
Ongoing process - Initial walkthrough completed and takes notes.