FBI has already interviewed Pagliano under immunity grant; investigation to conclude early May
As Hillary Clinton moves toward the Democratic presidential nomination, she faces legal hurdles from her use of a private computer server as secretary of state that could jar her campaigns momentum in the months ahead.
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A federal law enforcement official said that
barring any unforeseen changes, the F.B.I. investigation could conclude by early May. Then the Justice Department will decide whether to file criminal charges and, if so, against whom.
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Federal law makes it a crime to mishandle classified information outside secure government channels when someone does so knowingly or more seriously permits it through gross negligence. Mrs. Clinton has correctly pointed out that none of the emails on her server were marked as classified at the time.
The bureaus investigators have already interviewed Bryan Pagliano, a former aide who installed the server Mrs. Clinton had in her home in New York and used exclusively for her private and official email while secretary of state from 2009 to 2013.
http://www.nytimes.com/2016/03/03/us/politics/as-presidential-campaign-unfolds-so-do-inquiries-into-hillary-clintons-emails.html?_r=1