I'm listening to episode 61 of Mynock. They interview a Worlds judge.
And the judge was talking about how Wade or Frank or who ever told him that if a dial is looked at, that the opponent gets to look at and change an opponent's dial in response.
This is utterly ridiculous. If that's the actual rule or were to become the actual rule, there is nothing to stop you from purposefully doing it when exchanging dials would benefit you.
I see no option other than an immediate game loss. Players should be more careful, before picking up a dial, take a second to double check.