Google

Google AdSense Program Policies

Publishers participating in the AdSense program are required to adhere to the following policies. You need to read the policies carefully and refer to this document often. If you fail to comply with these policies, google may disable ad serving to your site and/or disable your AdSense account. While in many cases they prefer to work with publishers to achieve policy compliance, google reserve the right to disable any account at any time. If your account is disabled, you will not be eligible for further participation in the AdSense program.

Some Topic Included in the Policies.
Invalid Clicks and Impressions
Encouraging clicks
Site Content
Copyrighted Material
Site and Ad Behavior
Ad Placement
Competitive Ads and Services

Don't get your account ban. So it is your duty too to study the rules of Adsense.
Get the detail [Here]