Why your friend want that way? To learn a lesson? Well, just read on adsense topics and you will learn everything.
http://www.google.com.my/search?hl=en&q=how+to+get+your+adsense+banned&btnG=Google+Search&meta= - Dynashox -
Are you a good friend ? You could mention it clearly at first during creating this thread, what’s problem with your friend or with his website? What you’re trying to do reminds me an Adsense tip, “never tell your friends or colleagues, that you’ve an Adsense ready websiteâ€.