Adwords ads only partially reviewed by humans?

Danny Sullivan has expressed concerns about the approval process of Googe Adwords ads, and I agree, for ads that deliberately break the rules appear regularly, and stay there until someone complains, or a change in the ad prompts a human to look at it.

Google uses a combination of humans and technology to review keywords and ads for relevancy, editorial guidelines and our content policy. In many cases, ads are reviewed through automated processes first and then followed by human review.

The key phrase is "many cases". Sounds like a lot of ads do not get reviewed by a human, whereas in the past they all were. Makes sense, seeing as having humans reviewing ads is probably their greatest expense.

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