Reply To: giving someone chametz

If you are looking for a Shabbos goy (in those cases where amira l’akum is permissible), do you need to be certain beyond all doubt that the person you want to use is, in fact, a goy, or do you go by roiv? (E.g., Roiv people in BP who are walking on Shabbos with a cell phone in their hand and with their heads uncovered are goyim.)

Rav Belsky said that you have to be certain beyond all doubt that he is really a goy.