I mean, I remember one case in which a person engaging in intelligence activities had his kids in the room with him when he was meeting with someone. And you’ve never, you can’t imagine how unattractive it would be to present in court espionage in the background and two kids watching TV in the foreground. I mean it just, you’re not going to make a case that’s going to be binding. This is the bad guy you want to send away for life? You know, it’s a hard target because of the way they do what they do, and the fact that it’s so different from the others, and the fact that there isn’t, for the most part, the central direction and control that leads to the specificity you need to get the elements of the client.

http://www.pbs.org/wgbh/pages/frontline/shows/spy/spies/different.html