alcohol

Eating in a restaurant wherein alcohol is served

Q: If I eat halaal food like fish in a Christian owned restaurant where they also sell liquor, do you think this food would be halaal? Another question is that the place where I stay there are KFC and McDonalds, they proclaim themselves to be halaal because they got some official documents of halaal certifications. So should we believe them as Halaal or what's the procedure now?