The technology of monitoring location is interesting, of course, but why on earth would the police, who will not consent to civilian review, ever go along with something orders of magnitude more extreme? ObCrypto/Privacy: I suspect there would be an immense amount of radio traffic involved in keeping track of a substantial group of people, say, over 1000. I don't doubt the ability of the device(s) to transmit the information, but the ability of the receivers to digest it all in real time. -- ______________________________________________________________________ Don Doumakes Finger doumakes@netcom.com for PGP public key Foxpro databases built to your specifications. Email me for details.