On October 1, 1993, 12 year old Polly Klaas was abducted by a stranger during a slumber party in her home. The FBI was immediately called in. Agents collected fibers from her bedroom and discovered, through the use of laser light sources, a palm print on Polly's bed, previously invisible to the naked eye. After a massive two-month investigation, the FBI arrested Richard Allen Davis. Palm prints and fibers matched. Davis was convicted of abduction and murder.