re: To the "This could have been prevented crowed with stricter gun laws":

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You been watching too many Tom Cruise movies baw, this ain’t minority report.

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Huh? IBM Watson is already doing these things for Police Departments. And this isn't some highly technical system that's needed. 36 calls to one address should already be a red flag. Merging that with the police/psych report that uses words that "threatened with a gun" and a School System report that indicates he was expelled for "violent behavior" and you've got the killer on a list of one that needs to be monitored/assessed.

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Using IBM predictive analytics software to predict trends, allocate resources and identify crime hot spots, the city of Memphis, Tennessee, rolled out the police department’s Blue CRUSH (Criminal Reduction Utilizing Statistical History) methodology. The City of Memphis is using IBM SPSS predictive analytics software to improve its overall operations, enabling it to considerably reduce crime and expand its territory without a proportional increase in staff. Memphis Police Department recorded an 863 percent return on investment in just 2.7 months.

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LINK