If a rum person is eating a meal in a foil pan wrapped with foil and plastic eating with plastic flatware, anyone who “sees him” can tell he is NOT eating the same food as others. If he is wearing a baseball cap covering his yarmulka, then you can’t know for sure so he is NOT causing a ma’aras ayen and one would have to get closer to check it out. At which point they would see he is NOT eating the treif food but separate food.
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