With the tight control and policy of Google where the strategy is basically it is better to ban 5 innocent webmasters that letting go 100 fraudsters. A lot of webmasters novice and expert alike have to be on guard all the time about their Adsense if they want to continue enjoying Google blessing.
It is advised to have a look at your site statistic from Google Adsense website to spot any irregularities or suspicious activity across your website. If you think something is not right, do not hesitate to report it to Google before they find it out themselves. You will have more chance that way.
