The csi investigator's second walk-
is done with the initial responding officer in order to obtain information observed upon first arrival at the scene
includes detailed photography and fingerprinting
takes places before anyone, including the victim, leaves the crime scene
is a time when the csi investigator is collecting as much physical evidence as possible

2. Includes detailed photography and fingerprinting.  

Explanation:

The first walk through involves the designing of a a plan to carry out the process of crime scene.

The second walk through is done for the purpose of documentation. This process includes taking pictures and drawing sketches of the scene. It might also involve taking videos of the scene to assure that every detail of the crime scene is documented.

After this step, evidence are collected from the scene.

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