Interesting article. I don’t buy Kirkland olive oil because I’m not crazy about the taste. It’s not bad, I just don’t love it. I’ve tried getting California oils, even buying some that have date stamps for the time of harvest, and still wasn’t crazy about the taste either.
I love the brand Aulio, from Turkey, and I’d be very surprised to hear it was adulterated because it tastes so very, very good. No way of knowing without a chemist though! I guess I’ll buy Pompeiian or Kirkland for basic use and hoard the Aulio for dipping bread into.