Seems like the NSA does trust other law enforcement agencies at least to a certain level, with the use of parallel construction for illegally obtained evidence [1].<p>1. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Parallel_construction" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Parallel_construction</a>