Too many topics, too little time

So, how did the librarian get the word out? By regularly reporting to the library board that no NSL had been issued to any of the city’s 10 branches, which was perfectly legal. Everyone knew that if the chief librarian failed to report that nothing had happened, then indeed an NSL had been served.
[From Privacy Work-Around]

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Sometimes the brilliance of the common sense of librarians is amazing. Given tight legal restrictions, they read the law, and found a solution that was compatible and in the end worked for their library