Professor Ansarian: Should we investigate about the foods and sustenance of the host family when we go to their house as a guest?

There is no need to investigate and search regarding this issue, we basically judge human beings apparently; in other words, when a person is a Muslim, we consider his works and actions as proper and correct, and this is a religious and rational rule.

So, there is no problem to go to the house of those people who are believers and Muslim as a guest and investigation and searching about whether their foods and sustenance are Halal or Harm is not needed.