How Adsense Detects Fraudulous Clicks

The clicker’s IP address matches the one on your adsense account.
It’s a no-brainer. Don’t click on your own ads.
Suspiciously high CTR
According to a report I read, anything above 10% will be flagged, but 6% or 7% would probably be a safer limit.
Clickers’ IP addresses come from the same geographical area
This is for those who think they can get away with clicking on their ads from their