Little Paula is the only Mr. Wilson’s daughter. She was kidnapped while shopping with her mother at a shopping mall in Houston, TX. Few days later, Mr. Wilson left his house for breakfast at 8:00 am and return home at 9:00 am. He found a ransom note, written in black ink, slipped through the bottom of his house’s door. Security camera showed that there were four people loitering around his house’s door during that time: Anita, Larsen, Michael, and Mark. Police searched the houses of all four people and seized a black pen in each. The four pens were sent to a forensics lab to determine which pen wrote the ransom note and identify the kidnapper. In a forensics lab, we - as forensics technicians - use an important technique called Chromatography