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Purdue Algorithm Analyzes Group Chats To Identify, Stop Sex Offenders

A new tool from Purdue University could help police better prioritize potential sex offender cases.

The Chat Analysis Triage Tool, or CATT, is programmed to analyze patterns, phrases, keywords and emojis a suspect uses in group chats. It also looks at the victim's response. It could help police crack down on predators who want to meet with victims face-to-face.

Kathryn Seigfried-Spellar is an Assistant Professor in Purdue's Department of Computer Information Technology. She says the goal is to make catching predators easier and more efficient for police.

"We're trying to help law enforcement determine which chat shows an offender that's more likely to show up so that way they can prioritize the cases that they're working," she says.

Seigfried-Spellar also says the software is faster than a real analyst, and it's 80 to 85 percent accurate.

The data used to test the algorithm came from police, who redacted the names before sending the conversations to Purdue to analyze. All of the cases ended in arrests of the suspect.

The tool would be free for law enforcement and the team anticipates releasing it by the end of 2018.

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