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Similar to this question, suppose there is a chain of restaurants that is mostly non-Kosher, but there happens to be one kosher franchise in the chain. The example I am thinking of is that there is one kosher Dunkin Donuts near where I live, and many non-kosher ones. Is there a problem of Maris Ayin for me to publicly carry around a Dunkin Donuts bag from the kosher store?

If the answer to that is that there is no problem, what about if I pick up a donut on the way to a business trip out of town where there is no kosher Dunkin Donuts? May I carry the bag around there?

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Rabbi Heinemann shlit'a is of the opinion that there's no maris ayin issue if they're not especially known for non-kosher stuff. So if enough people go into a Dunkin Donuts just for the coffee (do they?), that should address the concern. No? It is an issue, though. Two Atlanta rabbis spent ten minutes in a Dunkin shop drinking coffee and talking with the manager about going kosher, and by the end of the day half the town was wondering if it was kosher. – Shalom May 2 '13 at 18:00
As a reminder, this site makes no guarantee of validity, and does not offer professional (particularly rabbinic) advice. Treat information from this site like it came from a crowd of your friends. – msh210 May 2 '13 at 18:25
I don't think DD is a problem, because you could have bought a coffee, or a bag of ground coffee, right? ...although I don't know if that can be generalized to all restaurants, though. – Shokhet Jan 21 '15 at 1:40

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