If they're putting themselves forward as an expert in Covid19, but they're not right now encouraging or wearing masks themselves indoors at meetings and the like, they're not an expert in Covid19. 1/
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If they think there's one blanket solution for controlling Covid19 spread indoors that can be applied to all settings, they're not an expert in Covid19. 2/
If they try to play off one intervention against another, or say this intervention is more important than another intervention, they're not an expert in controlling Covid19. 3/