Editor’s note: This story has been updated with a statement from Steve Serbalik, the attorney for Sgt. Dusten Mullen.
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A federal judge won’t stop the Phoenix Police Department from disciplining Sgt. Dusten Mullen, the off-duty cop who showed up masked and armed at a Chandler student protest in January and told local police there that he intended to bait the teens into assaulting him and getting arrested…