By Aruna Viswanatha WASHINGTON (Reuters) - U.S. FBI Director James Comey on Thursday made his strongest comments yet about encryption features built into new cell phones by Google Inc and Apple Inc, warning they could hurt law enforcement efforts to crack homicide and child exploitation cases. Speaking before an audience at the Brookings Institution, Comey said the new phones, which limit the ability for the companies themselves to access data stored on the units, have "the potential to create a black hole for law enforcement. ...



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