I am from a country where slaughter for graves is common. Is it obligatory to be careful about their slaughtered animals and to inquire about them in the case of funerals?

Question:
He says: Honorable Shaykh, may Allah grant you success. The questioner says: I am from the Maghreb region of North Africa, and I live there. The majority of the people in my city direct worship to other than Allah, and Islam for them is the exaltation of graves, building upon them, slaughtering for them, and calling upon them for aid. His question is: Given this situation, is it obligatory for me to be careful about the slaughtered animals sold in the markets? And if the dead of the town are brought, is it obligatory for me to ask whether this deceased person was upon the oneness of Allah or not?

Answer:
As for the slaughtered animals, if there are people in the country who slaughter according to the Shari'ah method and are people of the oneness of Allah, these slaughtered animals are to be considered as the slaughter of the oppressor; you take them as the slaughter of the oppressor. But if you are 100% certain, or if it is most likely in your opinion that they are from the slaughter of the grave-worshippers, then do not eat from them. As for the prayer, if you do not know who has something [wrong] with them, if you do not know, then the default is soundness. He says: Honorable Shaykh. It returns to you. If you know something about him. If you do not know anything about him, then the default is soundness.