As video technology improves, it becomes more difficult to trust. At MIT, they've gotten good enough at manipulating video images, that they are literally putting
false words in people's mouths:
A specialist can still detect the video forgeries, but as the technology improves, scientists predict that video authentication will become a growing field - in the courts and elsewhere - just like the authentication of photographs. As video, too, becomes malleable, a society increasingly reliant on live satellite feeds and fiber optics will have to find even more direct ways to communicate.