[Editor's Note: The entire article can be read from the link below. I only included the summary of which olive oils failed and which brands passed the standards specified by the Intnl. Olive Council and the USDA.Notice that the ones that failed are the most common brands found in supermarkets. Tell the supermarket mamager to stock the clean brands if he wants your business. You can read the UC Davis report from the link further below...Ken]
The University of California, Davis published a report on olive oil back in 2010 entitled Tests indicate that imported 'extra virgin' olive oil often fails international and USDA standards. In this report, researchers found that 69 percent of imported and ten percent of California-based oils labeled as olive oil did not pass International Olive Council (IOC) and US Department of Agriculture sensory standards for extra virgin olive oil.
Of those brands tested, the following failed to meet extra-virgin olive oil standards:
• Filippo Berio
• Newman's Own
• Rachel Ray
• Whole Foods
The following brands were found to meet extra-virgin olive oil standards as part of the study:
Be sure to avoid any olive oil labeled as "light," as these are the lowest quality olive oils available. Also, be sure to choose either California-based olive oils, the vast majority of which are legitimate, or imported olive oils certified by IOC.