  But the no-signaling theorem does not demonstrate that superluminal signaling would be impossible if orthodox quantum mechanics were not empirically adequate. Furthermore, this theorem does not show that superluminal signaling is in principle impossible in the quantum realm as depicted by other theories, which actually reproduce the statistics of orthodox quantum mechanics but do not prohibit in theory the violation of this statistics. In sections 7.2-7.3, we shall consider the in-principle possibility of superluminal signaling in certain collapse and no-collapse interpretations of quantum mechanics. But, first, we need to consider the necessary and sufficient conditions for superluminal signaling.