Hi George, Merry Christmas to you, yours, and the CypherPunks! Glad to meet another 'proffesional' security person. I worked for a major university doing all kinds of physical security and access abuse for 5 years. Was a lot of fun and got to play with all kinds of nifty stuff...:) My favorite is the toilet roll camera made for Airports.... I would agree w/ you as far as the telephone switch tap is concerned. The only way to find that is to get into the switch (or possibly the local police computer through a rf link). When I had posted my original reply I had not taken that into consideration. Since most police departments don't encrypt (or at least not strongly) their database searches from their in-car computers I can see a possible hole here. I really don't expect it to stay open very long however (a year or two at best). I know such data can be accepted by a normal pc w/ a scanner and modem. It should not be much of a step to put a xmitter online and do some spoofing.