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AnthonyKevin has spent the last few years learning as much as humanly possible about detecting doctored cards, and the methods used. He's extremely generous with his knowledge, and is one of the nicest guys in the hobby.
If you're looking for old Full Count posts, much of the board has been archived. Some of the links are dead, but there is still a lot there, and it's fun to go back and read the old threads. The last date you can access the message board is May 17th, 2001.
http://web.archive.org/web/*/http://fullcountbcc.com