It doesn't say why they're in there. I don't remember reading if they're in maximun or minimum security prison. And if they get away with publishing something like this, obviously the warden doesn't feel that they're much of a threat concocting these devices.
It is not entirely impossible that someone in prison deserves to be free, but the lack of mention as to why they're in there would seem to be most likely the result of an embarrasing (read: Rightful) reason for being locked up.
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