How long because the intelligence/military community has been doing this for decades upon decades through hard, soft, and transmitter taps on unsuspecting American citizens. Watch your gossip because some people out there are trained to pick up key words :)
Can you show me some evidence of US citizens being spyed upon without a warrant?
The MSM continually lies in this issue by characterizing this as surviellance of US citizens. It is not.
There has to be a foreign entity involved. If a US citizen becomes a target in the surveillance then a warrant is pursued but the Commander in Chief has the Constitutional duty to defend this nation from foreign entities and does not need a warrant to intercept foreign communications.
In regards to picking up ‘keywords’ on programs such as Eschalon they are not listening unless certain ‘keywords or phrases’ get flagged and then they still pursue a warrant to target US citizens for surveillance (which was supposed to be the reason for the FISA court)in due time.
But in the case of foreign entities then no warrant is needed. Nor should one be needed.