A federal trial judge exchanging emails with former colleagues in the U.S. Attorney’s Office while presiding over criminal cases “invited doubt about his impartiality,” a federal appeals court held.The 7th U.S. Circuit Court of Appeals last week vacated James Atwood’s sentence and ordered he be resentenced on three drug counts.The court directed the new sentencing hearing be conducted by a jurist other than U.S. District Judge Colin Stirling Bruce of the Central District of Illinois.Last year, Bruce …