how about a wrist/ankle/necklace band with bar code or RFID tag ? its small enough to not impact anything yet its connected to the rider him/herself and not a piece of gear that can be lost, stolen, borrowed, broken, forgotten. if its made stylish enough than i/people would want to wear it with pride all the time. the bar code or RFID tag could be linked to the persons name, status or level of certification and any other pertinent info. just having it on would be id enough but the info could also be read with a small hand held tag reader.
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"What is my problem with man you ask, NO! I ask you what was man's problem with me?"
-George Taylor
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