Kashrut: Food Served by Shomer Shabbat Jew

You may trust that the food a shomer Shabbat Jew serves is kosher without your needing to check it out.
However, if a shomer Shabbat host serves non-kosher food or food without reliable supervision on foods that need supervision, you may not eat it.
Note If the host will listen to you if you tell the host that the item is not kosher, you should tell him/her. If the host will not listen, you should not tell him/her.