As usual I don't trust them even if I can see them.
I was under the impression NSA could monitor such things as the net and phone comms, because if my memory serves me correct there was a fire storm during the Bush administration over the NSA eves dropping and data grabs? And according to CNET they do, so that would incline me to believe Janet is asking for something that already exists.
http://news.cnet.com/8301-13578_3-9890761-38.html
But to answer the question, I don't know. On one hand it sounds like a good idea, on the other hand you can't leave the house these days without being monitored in some fashion. But say it is different from the NSA program and they use it as intended, I would question how long would it be before the terrorists find another means to avoid detection.....in which case they will need another remedy.
If SPLC is writing the Instruction Manual and Guidelines for DHS I would be inclined to say no.