“The arrest of a National Security Agency contractor charged with stealing highly classified material is yet the latest example of a trend that officials say can be every bit as dangerous as an outside hacker: the insider threat.

…insider threats pose a delicate and difficult challenge and can be hard to detect, especially since large amounts of data can be downloaded quickly and stored on tiny devices.”

Read more: https://www.washingtonpost.com/business/economy/nsa-case-highlights-growing-concerns-over-insider-threats/2016/10/06/61b90a5e-8bc7-11e6-bf8a-3d26847eeed4_story.html