Problems:
1. Passive RFID tags do not transmit locational data - they have no way of knowing direction, and distance would be troublesome.
2. There is no way for these tags to know if a player has "possession" of a ball - merely that a transmitter passed nearby.
3. Response time from a tag may take up to a tenth of a second, which doesn't really solve the problem.
4. Certain players will not want to be tagged with chips that will enable their bodyguards to know when they're sneaking out of their room to have relations with bellhops.
I hope I don't come off as a wet blanket. You sound like you've spent a lot of time thinking the problem though.
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