Exactly. A scanner knows enough vocabulary to fool non-experts and thus is susceptible to developing DK. This definitely enforces DK as one of many factors. I

Exactly. A scanner knows enough vocabulary to fool non-experts and thus is susceptible to developing DK. This definitely enforces DK as one of many factors. I have met several such people. I have expertise in multiple narrow areas, and they couldn’t fool me. This has, in turn, made me skeptic in all other areas where I do not have expertise. I always have my guards up when I hear someone talk about anything.