Chad Sheehan

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ADVANCE FOR USE SATURDAY, MARCH 1 - In this photo taken on Jan. 15, 2014, Chad Sheehan, a Sioux City Police Department detective, talks about using social media to generate leads during an interview at the police station in Sioux City, Iowa. Sheehan is one of Siouxland's crime fighters who uses social media to get the word out about wanted suspects as well as to communicate with tipsters using Facebook, Twitter and "text-a-tip." (AP Photo/The Sioux City Journal, Tim Hynds) NO SALES, MAGS OUT, TV OUT, MANDATORY CREDIT