What is the ruling on cheese and dairy products that are suspected of containing pork derivatives, and is it obligatory to meticulously research the ingredients of food in non-Muslim countries?

A Muslim must seek out that which is good and lawful in their food. Most cheeses and dairy products are free from pork fat, so there is no harm in consuming them. It is better to leave that which is doubtful, based on the saying of the Prophet, peace and blessings be upon him: "Leave that which makes you doubt for that which does not make you doubt." There is no need for an overly meticulous search into food ingredients; it is sufficient to be cautious about that which is doubtful.