Again, you have no way of knowing which scouts are friendly, and which not. There are no infallible tokens of identity or loyalty (ever read the Lensman books?), and any enemy scout would doubtless tell you /anything/ he thought you wanted to hear in order to get you to let him go. And only a complete idiot would let scouts roam free around his encampment, knowing that they could full well belong to enemies who want to scout his encampment in preparation to /killing/ him.