Interesting:

Jared Loughner is a product of Sheriff Dupnik’s office

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Apparently he's been making death threats and Dupnik's office did nothing about it because his mother works for the county. We'll see if this pans out though, but if they could have intervened and forced the kid to get some help, but refused to, then that could have been the reason for the sheriff to come out swinging the partisan cudgel like he did in the first press conference.