It’s not as though the government sealing records for a specified amount of time is anything new, really. They do it often enough when they want to keep the methods they used to gather the information a secret so that potential future culprits won’t know what investigative techniques to avoid. Or sometimes they’ll turn up all sorts of personal information about people in the course of their investigation, and it would be rather tactless to release all of that to the public while those people were still around.
