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?

1. Package the swab in a paper envelope.

2. Moisten a sterile cotton swab with distilled water.

3. Gently rub the stain, covering the entire swab.

4. Allow the swab to dry thoroughly.

5. Shake off the excess water.