Dropbox found [Dustin Brown]’s images and reported them to NCMEC, which passed the tip on to the Illinois attorney general’s office. That office runs a statewide “cyber crime” unit that coordinates among trained investigators at all levels. In this case, the unit tapped Peoria police detective Scott Gamboe to handle the tip. Gamboe—an Army vet, Ironman athlete, and author of self-published fantasy novels—took the various IP addresses associated with the Dropbox account and sent subpoenas to Internet providers. This turned the numbers into addresses, and the two most relevant resolved to Morton High School and to the home of Brown’s mother. When combined with the Dropbox account information, the preliminary evidence pointed right to Brown. – Nate Anderson, Ars Technica

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