We are lucky enough to be able to buy olive directly from the producers, and this article below on the Investigative Reporting Project Italy site shows that in the face of increasing demand for olive oil in China and the US, there is an increasing tendency for unscrupulous producers to provide sub-standard or even faked oil. We have been struck by how cheaply some olive oil is sold here in France, sometimes half the price of what we pay when buying straight from the producers – this article may point to the reasons for this…
http://irpi.eu/valpesana-procura-di-siena-trova-il-deodorato/