Discussion on answer by Anonymous Physicist: What are the ethics involved in teaching my chair's child in my undergrad class?

@Neinstein: Who's suggesting banning anyone? The problem is you're still confusing "misconduct" with "conflict of interest". It's not the same thing. A conflict of interest arising isn't (on its own) a sign of anyone doing anything wrong. Nor does it have to be eliminated - it should be managed proportionately. Sometimes this may just mean acknowledging it; sometimes putting arrangements in place to maintain oversight/transparency, and (very occasionally) replacing/removing/banning someone. Saying "Banning someone would be too much so this isn't COI" is putting the cart before the horse.