Re: The halal-ity of your food.
If you are shopping are at a grocery store which isn’t owned by Muslims, then that halal symbol does no good for you because for the meat to be halal it has to be slaughtered by a Muslim and has to stay under Muslim supervision at all times. If the meat was slaughtered by a Muslims but then a non-muslims delivers it or sells it, that meat isn’t halal anymore because it lacked Muslim supervision.