That's why it's best to load up on the false information, tag random people as you, and generally create noise. Lots of noise. Kind of like what gets generated for the keyword searches which are useless due to all the noise.
Oh, that's happened. Don't go forgetting about the Chicago black sites and a bunch of other illegal detainment facilities that have been used (g8/g20/OWS)
OWS was the big one really. It saw law enforcement cooperation not just across NA, but globally, to put down the protests, to share tactics, and also to threaten the activist leaders at the time into hiding. Many had been branded by the electronic system and profiled.
Use those aliases.