And so what happens if you answer "no" if asked, before you receive an NSL, whether you have received one... Are you then required by law to answer "no" again?

And so what happens if you answer "no" if asked, before you receive an NSL, whether you have received one... Are you then required by law to answer "no" again? Because if you change your answer, then that's a bit flip and you have transmitted information? What if you answer "yes" before? Are you required to answer "yes" after ?