UC-Davis has just published an extensive report on the fraudulent labeling of extra-virgin olive oil. Imported olive oil has been known to often have fraudulent or misleading labels, now certain US brands have been found to be mislabeling their olive oil as well.

"More than two-thirds of common brands of extra-virgin olive oil found in California grocery stores aren't what they claim to be, according to a report by researchers at UC Davis, " said the Los Angeles Times in the story linked to below.

Scroll down to page 10 of the UC-Davis report here for the chart of the various brands.

http://olivecenter.ucdavis.edu/news-e...

The tests to determine extra-vrigin oil (acidity, peroxide level, etc.) are listed and described.

"Lab tests cast doubt on olive oil's virginity"

Los Angeles Times

http://www.latimes.com/business/la-fi...

Found to have be fraudulently labeled as Extra-Virgin:

Whole Foods

Rachel Ray

Safeway

Newman's Own

Colavita

Bertolli

Filippo Berio

Pompeian

Star

Carapelli

Mezzetta

Mazzola

Found to be accurately labeled as Extra-Virgin:

Kirkland Organic

Corto Olive

California Olive Ranch

McEvoy Ranch Organic