reporter: federal prosecutors say the man in question is 23-year-old ray sean harold. bullets at great american tower. old-fashioned detective work and a new tool. >> we' re not going to forget that has caused terror in this community. reporter: they say ray sean harold is a big part of that terror. a gun caused panic last year. that' s when someone fired at the great american tower. 17 bullets hit the office building. >> no indication anybody was targeted. now identified as a ford fusion, they identified bullets and that was put into a database called the national integrated ballistic information network. and there it stayed until may. another high-profile case ended with harold convicted. the system linked bullets from his shootout to the bullets that shattered nerves and great american tower. we' re not saying definitively that he fired the shots but police seem confident in their case against him. >> you will see more cases solved based on this technology. >> eight-hour dump-in calls -- involves the collection of cell phone data to identify a suspect. i asked what role that might'