As a non-expert, if someone says something unusual that would require expertise in the field to say with credibility, I have every right to verify their experti

As a non-expert, if someone says something unusual that would require expertise in the field to say with credibility, I have every right to verify their expertise. Or to at least verify whether or not they have a history of things like “being convicted of fraud” or “being barred from practicing medicine due to publishing fraudulent papers in the Lancet”.