1. DETECTIVES: THE PROOFS

The group of hard-working detectives, with their sergant in charge, did their best to collect the proofs of the vicious crime. They took pictures at the crime scene and of all the items they have found there.
The crime scene:

Item #1 - the body

Item #2 - blood stains with fingerprints

Item #3 - the pocketknife

Item #4 - the knife probably used in the crime

Item #5 - empty alcohol bottles found at the crime

Item #6 - blood stains at the crime scene