Preserving and Isolating Versión en línea click one and note what category it is in. Once you know the category select the rest of the choices that fall under that same category por Franchesca Beningo 1 First Officer on the Scene 2 Those involved in conducting preliminary walk through 3 Purpose of Preliminary Walk Through 4 Types of Evidence to note in Prelim walk through Determines nature of crime Request medical assistance if needed Conduct initial walk through Isolate the scene Detain suspects and witnesses Responding officer Crime scene investigator Lead detective Note transient and conditional evidence Note bodies condition and estimate TOD (medical examiner) Protect physcial evidence from being altered Interviews with first responder, victim, witnesses Note and record details of setting, pre and post observations lights on/off doors locked/unlocked trace evidence temperatures and odors signs of prior activity