Source: Clinton IT specialist revealing server details to FBI, ‘devastating witness’

From Fox News:

The cross-referencing of evidence could help investigators pinpoint potential gaps in the email record. “Don’t forget all those photos with her using various devices and it is easy to track the whereabouts of her phone,” the source said. “It is still boils down to a paper case. Did you email at this time from your home or elsewhere using this device? And here is a picture of you and your aides holding the devices.”