Interagency interrogation teams have started to question key terrorism suspects under a classified charter approved last week, but authorities have been slower to resolve pressing issues that emerged since Christmas -- including how to draw the line between gathering intelligence and building a legal case, according to federal officials and experts following the process.

The High-Value Detainee Interrogation Group, announced to fanfare by White House officials last summer, was not formally authorized until Jan. 28, under a previously unreported 14-page memo signed by the president's national security adviser, Gen. James L. Jones.

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