FBI : Investigator says federal law forming basis for ` ` The Departed '' ' . NEW : Official says interrogators threatened families , faked murders . Attorney general says ` ` review into whether federal laws were violated '' Officials want transparency on research that alters laws ` ` best practices ''
NEW : Investigator oversaw federal probe forming basis for `` The Departed '' movie . NEW : Report says interrogators threatened families , faked murders . Attorney general wants `` review into whether federal laws were violated '' Officials promise transparency on research that alters interrogation `` best practices ''