There's a pretty easy test. Just start talking about the illusion of the ego. People who've never experience ego death will have no idea what you are talking

There's a pretty easy test. Just start talking about the illusion of the ego. People who've never experience ego death will have no idea what you are talking about. Given that ego death is pretty much only caused by epic trips or a profound mastery of meditation, you should be able to get an idea fairly quickly.