Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 10 months ago

Non Muslim seller who claims that the meat he is selling or wants to sell is Halal can not be taken as an authentic evidence that the meat is really Halal. If Muslim tells you that his meat is Halal and you have no reason to doubt his statement, then you can take the neat as Halal.

Restaurants selling alcohol or pork can never be trusted as utensils and plates used in cooking or serving alcohol or pork  become Najis and and every other food put in Najis utensils and plates becomes Najis as well.