Patent ID: 8917165

Claim:
A method of detecting and re-personalizing RFID tags, comprising: obtaining a used single-use first anonymous ID (identification) from a RFID tag, the RFID tag comprising a memory divided into a first rewritable portion and a second rewritable portion, wherein said used single-use first anonymous ID is stored on the first rewritable portion; generating a single-use second new anonymous ID different from said used single-use first anonymous ID; and determining if contents of said first rewritable portion and said second rewritable portion agree; wherein, if said contents agree: using either contents of said first rewritable portion or contents of said second rewritable portion to lookup a subject's record in a database, unlinking said used single-use anonymous ID from the RFID tag after reading the used single-use first anonymous ID when said single-use second new anonymous ID is generated, and writing said single-use second new anonymous ID to said second rewritable portion of said memory of said RFID tag; and wherein if said contents disagree: individually using contents of said first rewritable portion and contents of said second rewritable portion to lookup said subject's record in said database, and writing said single-use second new anonymous ID to one of said first rewritable portion and said second rewritable portion having bad data stored thereon.