How do you identify good EVOO and spot fraudulent ones?

Four things to look for: (1) Opaque packaging -- glass or tin. Light degrades olive oil; avoid clear bottles. (2) A harvest date -- always buy the most recent harvest (October-January each year). (3) A named origin and olive variety -- if the label can't tell you where the olives came from, walk away. (4) Third-party test results -- Kosterina publishes independent chemical analysis for every harvest at kosterina.mom. The best test is taste: great EVOO has a grassy, fruity aroma and a peppery burn at the back of the throat.