In a luxury Washington, DC, hotel last month, governments from around the world gathered to discuss surveillance technology they would rather you did not know about. The annual Intelligence Support Systems (ISS) World Americas conference is a mecca for representatives from intelligence agencies and law enforcement. But to the media or members of the public, it is strictly off limits. Behind the cloak of secrecy at the ISS World conference, tips are shared about the latest advanced ... methods used to spy on citizens - computer hacking, covert bugging and GPS tracking. The use of such methods is more commonly associated with criminal hacking groups, who have used spyware and trojan viruses to infect computers and steal bank details or passwords. But as the internet has grown, intelligence agencies and law enforcement have adopted similar techniques. The current method of choice would seem to be spyware, or trojan horses," said Chris Soghoian, a Washington-based surveillance and privacy expert. "When there are five or six conferences held in closed locations every year, where telecommunications companies, surveillance companies and government ministers meet in secret to cut deals, buy equipment, and discuss the latest methods to intercept their citizens' communications - that I think meets the level of concern," he said. "Decades of history show that surveillance powers are abused - usually for political purposes."