No. The correct answer is that in the U.S., if the Agent in question has a valid subpoena or N.S.L., you must comply. If he doesn't, then you do not have to comply.
I cannot answer for any other jurisdiction.
Also, make sure you have staff attorneys well-versed in Internet law -- you'll need them either way.
- - ferg
The federal government clearly has the authority to manage communications across the border of the country and between states but it would be questionable if the federal government has the authority to manage any communications completely within a state. Do they have the authority to tell me to turn down a connection that terminates within the same state that I am in? Sure, they would have the authority to tell me to turn down any international tunnels I might have running or a point-to-point that crosses state lines but I doubt they have the authority to tell me to turn down a cross-connect terminating in the same building. That would be the jurisdiction of state authority, not federal.