How To Block RIFD Tags

That's right you can block. The idea is simple: broadcast on all channels. The search algorithm recurses forever or something. I wonder, though, if one block tag would take out everything or just you. Rememeber radio waves are awesome because they're unidirectional and omninescent.

"RFID readers can't talk to more than one tag at a time, so when multiple tags reply to a query, the readers detect a collision and revert to what's known as a singulation protocol to communicate with each tag individually. To accomplish this, the reader queries each tag for its next bit, which identifies which portion of a binary tree the tag resides on. When queried, a blocker tag responds with a '0' and a '1' bit. This causes the reader to start over and explore the entire tree."

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