Kevin is a crime scene investigator. He believes he has found saliva on the floor of a crime scene. Since he cannot cut out a piece of the floor, which steps should he perform to collect the saliva sample? Package the swab in a paper envelope. Moisten a sterile cotton swab with distilled water. Gently rub the stain, covering the entire swab. Allow the swab to dry thoroughly. Shake off the excess water.