Officer Green Has Been Dispatched to a Hotel That Is

Officer Green has been dispatched to a hotel that is the scene of a shooting. He sees the following items with potential evidentiary value scattered about the scene:
•6 shell casings that are scattered around the room
•A dirty towel on the floor near the bullets What should Officer Green do with the shell casings?

A) Place the shell casings in an evidence envelope and send it directly to the crime lab.
B) Carefully examine each casing and place those with extractor markings in an evidence envelope but discard the rest.
C) Carefully mark each shell casing and place it in a separate evidence envelope.
D) Take close-up photographs of each shell casing without moving it and then place it in a hazardous waste container.