Disable of google adsense account

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I guess some one you out there are using google adsense too!!I must admit google adsense is one of the good way to earn extra income but some peoples have complaint over the recent years that their account was disable because of invalids click!!! Although i have heard that they don't even know what had happen but just get banned from using the programme! What do you think about the decision of google? Is that the right way?