Compare these scenes from Enemy of the State (1998) with the video posted by Katina Michael on Communications of the ACM regarding the limits of watching.

"We're there now!"  

A scene from Enemy of the State (1998)

A scene from Enemy of the State (1998)

A scene from Enemy of the State  (1998)

A scene from Enemy of the State  (1998)

Now read this article on the limits of watching by Katina and MG Michael (2013) and watch the following report as an addendum to the article.

Covert HD Audio-Visual Recording Pen purchased in 2011

Covert HD Audio-Visual Recording Pen purchased in 2011