I think I blogged on this years ago. Found this today.
"The brands that failed to meet the extra virgin olive oil standards, according to this study: Bertolli, Carapelli, Colavita, Star, Pompeian. Eat Grown Local also reports: Filippo Berio, Mazzola, Mezzetta, Newman's Own, Safeway, and Whole Foods in this list; the data may be from the earlier 2010 study when more brands were evaluated.
The real deal: California Olive Ranch, Cobram Estate, Lucini. Kirkland Organic, Lucero (Ascolano), McEvoy Ranch Organic are also noted by Eat Grown Local."
How do we find the real thing? Olmsted recommends a few reliable retailers, including Oliviers & Co. in New York and New Jersey. Otherwise, look for labels reading “COOC Certified Extra Virgin” — the newly-formed California Olive Oil Council’s stamp — or the international EVA and UNAPROL labels.