Issue 58: There are three ways to prove the impurity of something:

1- When a person, him or herself makes certain that something is impure; but if they doubt it whether something is impure, it is not necessary to avoid it. So, eating and drinking is allowed at stalls and guesthouses where people with no scruples about impurity frequent to eat, provided that one is not certain about the impurity of the food being served-and this is usually the case.

2- When someone who possesses or handles something, says that it is impure. For instance, if one's wife or a cook says that a particular cooking utensil or any thing they handle is impure, then it is impure.

3- When two reliable people confirm that something is impure, and even if only one reliable person confirms an impurity, it must be avoided.