Any way to deny people from using proxy servers?

I've been having a bit of drama with my site recently. Apparently, a disgruntled former member of my site who I had banned for making threats to females (don't ask, it's all crazy) has started up his own forum, only, he's been copying content from my site and posting on his, verbatim!! I know it's hard to believe something so ridiculous, but you have to see it to believe it:

http://forums.yellowworld.org/index...=ST&f=36&t=1737

Here's my problem: I can't determine what his IP address is, because I think he's been using a proxy server to spoof it. Is there any way to deny access to anyone visiting my site through a proxy? I'm also suspicious that he's taken on a different username on my site and is continuing to post, but cant' be sure.

Any suggestions?

 

 

 

 

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