How to identify Pada Parama Persons?
I wish i knew more about what sutras say about this. Also, some things on the top of my head:


You observe whether a persons teachings are congruent with how that person acts.
By direct experience. You try out the teachings for yourself to find out whether they work for you or not.
By asking for clarifications to see if initial claims can be substantiated further. (A wise person once said that extraordinary claims require extraordinary evidence).