In a report compiled by the UK’s Ministry of Defense think tank the Development, Concepts and Doctrine Centre, several emerging technologies were singled out as being potentially used in threatening ways by terrorists. Things like Big Data and 3D printing are singled out as potential threats due to their ability to provide terrorists with the ability to employ dual-use or commercial technology in unexpected and innovative ways that they may not see coming. You can read more of my analysis of the report over on 3DPrint.com: http://3dprint.com/123746/uk-govt-3d-printing-threat/