AWA cites an example of when an entire AdWords might be reviewed.
[Link to quote
"What would one such exceptional circumstance be? "
TomWaits, here's an example that should serve to illustrate the principle:
If, in an account with many approved ads, an advertiser submits an ad for 'product XYZ' which links to a site which offers an illegal product or service, then all the ads in the entire account may be reviewed again. Why? To make sure that things are still as they should be.
However, the ads would be reviewed right then and there - and either approved or disapproved. In other words, they would not be sent into into "review purgatory".
Hope that makes it clear.