Stephen Tashi said:
...it looks like the fourth admendment isn't a useful tool for preventing massiive data collection...The man-in-the-street also thinks that there are constitutional protections against wiretaps on telephones without warrants...
This raises an important point which is rarely discussed: in the digital age, what legally constitutes a "wiretap", or "intercept", and who defines this? The US Supreme Court? A classified Presidential Directive? Or just agency-specific procedural guidelines?
In the old days a wiretap or intercept implied THE ACT of accessing the information flow. An authorizing warrant or other legal basis would be forward-looking from that point (IOW you can't intercept something in the past). It also equated intercept with human interpretation.
In recent decades, the NSA routinely and indiscriminately eavesdroped on millions of private US communications each day, apparently without any legal basis. This has been discussed in James Bamford's books and other places. The intercept method included antennas near microwave trunks, gigantic satellites with antennas 255 feet in diameter
http://www.globalsecurity.org/space/systems/magnum.htm, and more recently direct optical taps on Internet Exchange Points:
http://en.wikipedia.org/wiki/Room_641A
Apparently these actions are not defined as eavesdropping, collecting, or interception -- until a human being scrutinizes resultant data. Back in the day it would be like arguing a wiretap to a tape recorder wasn't eavesdropping until someone listened to it. E.g, DOD 5240 1-R says: "Information shall be considered as "collected" only when it has been received for use by an employee of a DoD intelligence component in the course of his official duties."
http://www.fas.org/irp/doddir/dod/d5240_1_r.pdf
The problem is increasingly sophisticated computer AI can be leveraged against recorded metadata AND CONTENT without (apparently) this legally being a wiretap or intercept.
Imagine a supercomputer like IBM's Watson which sifts through oceans of pre-recorded, intercepted data, applying human-like evaluation. He's been taught by humans, but because he's not human this doesn't constitute a wiretap, intercept, or eavesdropping. Then one day he says "Dave, I've found something very important. You'll need a warrant before I show it to you. But I can provide all the corroborating basis for obtaining the warrant -- names, dates, locations, etc."
With that in hand the human gets a "particularized warrant" that's specific to the two parties in the communication. However -- because NSA has been recording (not just intercepting) everything they've done and said the past five years, the warrant enables retroactive scrutiny, not just forward-looking monitoring.
I'd be interested if anyone can authoritatively confirm how intercept/wiretap/collecting is legally defined regarding signals intelligence collection, and who the governing authority is.