Updated.
I would say that it depends on the number of psis you might have to deal with, but, honestly, if you know there's one you're likely to start training everyone to protect against intrustion, because you know there has to be more.
I would say that it depends on the number of psis you might have to deal with, but, honestly, if you know there's one you're likely to start training everyone to protect against intrustion, because you know there has to be more.