For most dod servers theres an ident_icon over players heads so there own teammates will give them away and dont forget you're MIC icon shows up when you speak. There are many ways this plugin can and will be defeated.
The only way to detect a hacker with 100% accuracy would be to devise a plugin that calculated the suspected hackers shots and did an average of the hackers accuracy and if the accuracy was at such a level that was impossible for a human to achieve then the hacker would be identified.
I havent seen anything thing like that since hackcam and thats no longer in production AFAIK.
http://www.youtube.com/watch?v=ghRYZJy95oo
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{FJ}Justice STEAM_0:0:633975 If anyone needs any help with their server, Just add me to steam friends and I'll help you out.