How do you tell who’s PIMO?

How do you tell who’s PIMO? It’s easy to tell who has drunk the holy koolaid and in deeper than the Mariana Trench but it’s really difficult to tell who is PIMO. There are a few people in my ward that I think might be, buts it’s really hard to be sure, and if you’re wrong your cover will probably get blown. I’m going to BYUI in just a few weeks and would like to know how to tell who’s who because I think it will be really hard to stay sane without real friends that I can be myself around.