R.C. Gaitlin, 21, walked up to two patrol officers who were showing their squad car computer equipment to children in a Detroit neighborhood. When he asked how the system worked, the officers asked him for a piece of identification. Gaitlin gave them his driver’s license, they entered it into the computer, and moments later they arrested Gaitlin because information on the screen showed that Gaitlin was wanted for a two-year-old armed robbery in St. Louis, Missouri.