&gt; From what I understand, an NSL could be presented and it&#x27;s validity argued but it would never be presented in an open court.<p>Both the validity of the NSL <i>and</i> the application of a nondisclosure (&quot;gag&quot;) order to an NSL (not all NSLs are inherently gag-ordered) are reviewable by court, and gag orders <i>have</i> been struck down by courts.<p>So its not at all the case that an NSL would never be discussed in open court. Still, its impossible to say what NSLs have been issued with gag orders that haven&#x27;t been struck down, since those particular orders would not be publicly disclosed.