What can I do to prevent sabotage?

We understand your concerns regarding invalid clicks. In order to prevent abuse of the AdSense program, Google utilizes both automated systems and human reviews to monitor clicks on the ads. Google's technology analyzes clicks to determine whether they fit a pattern of invalid use intended to artificially drive up an advertiser's clicks or a publisher's earnings.

A good way to ensure that you do not create invalid clicks is by reviewing and remaining in compliance with our Terms and Conditions and program policies:

In addition, you can review your site's traffic logs for suspicious activity and notify us with any findings. This information can help us in resolving any issues, although as outlined in our Terms and Conditions, Google will use its sole discretion when determining instances of invalid clicks.