The (undoubtedly heroic) future efforts of EFF inter alia on this issue aside, absence of a surveilance signal will be seen as suspicious signs (just as use of cryptography is now) by certain authorities. This is a basic principle of SigInt (Signals Intelligence), also used by some crackers (go where the security is)

The budding nanoengineers among you would be better served by rigging 'nothing interesting to see here' nanites - maybe transmitting endless hours of you playing Quake. Badly.

But, honey, I'm not playing a game. I'm recording part of the house security system -- because I'd be lost, if something happened to you.