EDITOR'S NOTE: This article was removed because it was out of date. Here's an update from the author:

Update from Deane Alban:

Since I wrote the olive oil post 2 years ago there has been some changes. U of California has a newer study and some things have changed. For example California Ranch did not pass the latest EVOO standards. Class action suits have been filed against 2 of these OO distributors.

If you are concerned about the quality of your OO, I recommend you read my most recent post which contains all the latest updates: