National Security Letters (NSLs) are the things that every time they have been challenged in court the FBI drops the request, right? Since they don't want to te

National Security Letters (NSLs) are the things that every time they have been challenged in court the FBI drops the request, right? Since they don't want to test the constitutionality of them? Seems like the University of Pittsburgh didn't call up the EFF and instead capitulated to a likely unconstitutional request. https://www.eff.org/issues/national-security-letters https://www.eff.org/issues/national-security-letters