[bentice]

Most of the ad industry believes that because they use a 3rd party impression or click tracking they are safe from these attacks. This article outlines how ad fraud operations find vulnerabilities in those technologies that the ad industry trusts. 3rd party verification does not mean you have avoided fraud.

[jklinger410]

I didn't just leave it at impression and click tracking though.

[bentice]

To track from impression to purchase you would probably be using one 3rd party service. Google has the best capabilities but you are still relying on them to not have any vulnerabilities and their incentives of selling adds and verifying them for you aligned.