“Olive oil is a $1.5 billion industry in the United States alone. According to Tom Mueller, an intrepid journalist who wrote a scandalously revealing book on the subject, 70% of the extra virgin olive oil sold is adulterated — cut with cheaper oils. Apparently, the mob’s been at it so long, that even most so-called ‘experts’ can’t tell a real olive oil from a fake olive oil based on taste alone.”
http://www.foodrenegade.com/your-extravirgin-olive-oil-fake/