Scott Lalliss's reflection is seen on the platen disk of a hard drive being cleaned in a sonic cleaner with 91 percent alcohol solution at the Defense Computer Forensic Laboratory Sept. 9, 2010, in Linthicum, Md. The 9 percent of water in the solution develop bubbles that gently move dirt and other organic matter away from the disks that may contain valuable evidence in an investigation. Mr. Lalliss is a senior forensic technician. (U.S. Air Force photo/Lance Cheung)