In order to understand how to detect tumah in a person one must find a person who is not tamei. Unfortunately, we don't have a kohen Gadol. But we can see partial holy people.
I believe that Tumah effects ones way of thought. The following cant be taken that if one posesses one the mentioned traits below, then he is tamaei. Rather there is a uniqueness to these and on a path but not only to a kind of self-destruction. The Greatest weapon in the world is when you can take someone and turn him on himself.
- feverish swelling
- there are other things that don't come mind at the moment
- but there is one MAIN ONE .. i have labeled it as being blocked.
The sons of Eli the Kohen Gadol had sinned against Hashem (you can read more about it in shoftim). Eli the Kohen Gadol, let his kids know (not an exact quote) "To sin against man is one thing, but to sin against Hashem - who can say anything or justify it". THe following pasuk states (something like this, you can look it up) "And Eli's Children good not hear him because of their sin".
They were blocked....
I found this in many places.. including Pharoh in Egypt, Nebuchadnezzar (Hashem called him his servant - meaning although he would think he is in control - Hashem pulls the strings), Yom Kippur war - (ARab general pulls back which leads us win), OG and Sichon in the Torah -(Hashem hardens their hearts so that they fight us to that we can earn the land), Sancharib & Yael and in my own life.
Blocked does not just mean preventing one from doing tshuvah. It prevents a smart person from hearing a good idea. (I hope you are understanding this).
The most amazing thing about this is that even if you are concious of this blocking it can't be stopped.
How can we fix this?
Hashem has given us the instruction.
Hashem's Law is above our own thoughts and above all thoughts.
This includes Rabbis. I love Rabbis, like listening to them.
But i draw the limit of control. That is reserved for Hashem.