Talk:Friendship is Magic animated media/@comment-26100403-20161018001104/@comment-26100403-20161018220439

It would be doable. In reference to identifying whether a sighted disguised changeling is good or not, the good changelings could establish a code word, secret signal, or specific identifying marks they would use. If somehow there were defectors, which would be unlikely, there would be no way to tell the difference.