A federal judge said he will not disqualify U.S. Attorney Byung J. "BJay" Pak or his office from handling an ongoing investigation of a former city of Atlanta chief financial officer. 

District Judge Timothy Batten of the U.S. District Court for the Northern District of Georgia also affirmed as constitutional Pak's use of an in-house filter or taint team, which has already reviewed thousands of former city CFO Jim Beard's personal emails that federal investigators seized with a search warrant from Beard's AOL account earlier this year.

Pak's spokesman declined to comment.