Players should not be penalized via a remedy for errors their opponents make. Example: If one of your opponents inappropriately drops a card from their hand on the table, you do not receive a penalty if you see it.
§ 702.11.a Tournament Rules PDF (officieel)
§ 702 Game Play Errors
§ 702.11 Looking at Opponent Private Information [Warning]: A player accidentally looks at information that is private to their opponent. See CR 128. Privacy for information types.
