The good ones identify themselves. The bad ones can be tracked by logging every page request while setting a cfid/cftoken. If a series of page requests from the same agent/ip is showing a different cfid/cftoken per request, then either its a user that does not support cookies (even session ones) or its a bot. There are other ways as well including hidden pages that real people would never visit and the like, but the one above is the method I use and it works rather well.
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