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<p>[QUOTE=&quot;USS656, post: 183489, member: 6641&quot;]<span style="color: black">After 6 years with a security clearance and constant drilling buy US guys in suits, I am as paranoid as they come. </span></p><p>&nbsp;</p><p><span style="color: black">I worked in the security industry for more than 13 years. I was part of a private group that worked on early RFID cards and readers. The RFID IC chip that goes into the badge on the attached photo is a little bigger than a pinhead and the antenna can be very small and thin. (Very easy to conceal) The bigger question is how to transmit with the metal from the coin around it. Normally the metal from the coin would detune the antenna connected to the chip. They may use the coin metal as a form of antenna? The range for this type of chip is even with the coin as an antenna would be very short and would have to be powered from a RF reader in close proximity. (this is how it is done even for larger animal tags) It is more likely that it is some form of RF transmitter with a small battery(probably a short life though). Again they would probably have to use the coin as the antenna to get enough strength. This would be an active signal and could transmit potentially far enough not to be noticed by someone unsuspecting (maybe 100&#039;, maybe more?). If the coin was handed off, the bad guys could get the coin back by asking for specific change and offering a bonus - for say any large coins like a half or silver dollars. I&#039;ll do it if I see one sitting in a cash drawer. Hope this helps explain how it might be done.</span></p><p>&nbsp;</p><p>&nbsp;</p><p>Darryl[/QUOTE]</p><p><br /></p>

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