Since I haven't read CALEA, I can't comment as intelligently as others who have, but it looks as though it was put together in the dark. Just from reading this discussion, something else struck me as having the potential to be relevant here, if perhaps only in a periphery way. Its a project called PERM http://swing.cs.uiuc.edu/projects/perm/, an addition to a computer's IP protocol stack which would essentially allow multiple computers to collaboratively share each others wireless bandwidth among multiple broadband carriers. As I understand it, PERM analyzes your traffic and basically load balances it with neighbors who choose to participate in PERM. It doesn't need participation from ISPs in the sense that its the end hosts themselves that handle the sharing of bandwidth. Participating hosts collaborate amongst each other and re-route traffic amongst each other across multiple upstream carriers in a neighborhood. If a person were browsing the web, for example, on a computer running PERM and there were multiple neighbors with wireless access points connected to different carriers, then depending on the destination, traffic from a single computer could easily traverse multiple ISPs. If PERM became widespread, and who knows - it seems like it could in the future, tracking people down in the CALEA sense (from what I gather from this discussion anyway) would become much harder even if ISPs could provide the kind of tapping abilities that it seems CALEA calls for.