A lot of the terrorists are using disposable cell phones. Make 5 phone calls and throw it away. The courts cannot keep up with such authorizations. They cannot move quick enough. Anyhow the President can authorize such phone surveillance completely apart from the FISA court process. Clinton and others did it
You are quite right about the disposable cell phones . I have a friend in Amsterdam who knows a guy who deals with low level Afgan drug dealers in Netherlands. They all use disposable cell phones , dead cheap over there and actually very good phones.They buy 6 or so at a clip. They can do international calls with speed and clarity . By the time you got a warrent that phone you were worried about would be in the bottom of the river. The same people bitchin would be the first ones to go nuts is another attack did happen and a missed phone call was part of the cause.