INspector calls

At first you have no suspicions of the Inspector, but as the play gradually moves on it slowly dawns on you that the Inspector might be an impostor. In this essay I am going to write about a few different points, and who the Inspector might be. All of my theories may be correct but we will never know which theory is actually right.
The Inspector is obviously as real as all the other characters in body and can eat and drink and is solid. I know that J.B.Priestley became very interested in the fourth dimension and time. That is why I think that the inspector may have gone back in time or there might have been a time slip of some sort to make sure that these people new what they had done. Another theory might be that the Inspector represents truth and is not a real person at all but just a representative of justice. I think that this is a very plausible idea and probably Priestley's own thought.
I think that the Inspector gives it away when he gets far too emotional and ...