details. >> once the second most powerful man at the sheriff's department, former undersheriff paul tanaka turned himself in to federal authorities charged with obstruction of justice. in a scandal that's rocked the department for several years. >> tanaka had a large role in institutionalizing the illegal activity in the sheriff's department. >> the fbi claims tanaka and former captain tom carrey took extraordinary steps to cover up inmate abuse at two jails. in 2011 when deputies learned an inmate was acting as an fbi informant, investigators say they tried to hide that informant from the fbi making it appear he had been transferred out of custody. even changing his name to several aliases so he couldn't be found in the computer database. >> cover-ups, diversionary tactics it, retribution and a culture which is generally reserved for a hollywood script. >> already seven lower level deputies tied to the case have been convicted. in a statement, tanaka's