In light of the news yesterday of the NSA's new tool, XKeyScore, and the news today about Googling "backpack" and "pressure cooker", I have a modest proposal. Let's have cameras installed in each room of our homes, and have them record 24/7. These video feeds will be sent to a server--let's call it RAINBOW--at the NSA, or the FBI, or the Department of Homeland Security, or the intelligence agency of your choice.
Now, about six weeks ago, I would have said "They won't actually be searched until a FISA judge issues a secret warrant, and to make things quicker and more convenient, the warrant would not need to be relevant to any ongoing investigation", since that was the intel tune at the time, but since XKeyScore apparently does not need any judicial oversight at all, I'll dispense with that. Besides, this isn't really a search, per se; rather, it would be a search of the metadata, so there's no Fourth Amendment violation, even if innocent Americans' camera feeds were accessed by mistake.
Then, when situations like when Russia told us to watch out for guys like Tamerlain Tsarnaev, the FBI could just search this database, and, in that case, see that he was in his home making bombs with black powder and pressure cookers, and arrest him before the Boston Marathon bombings. It'd save a lot of lives and injuries.
I, for one, welcome our new NSA overlords!