No they are not:
>jails are powerful in all the wrong ways. . . . This is what corrupted power looks like. . . . Police departments are often the same.
The article talks about prisons scanning mail. The OP then says that prisons are corrupt, then throws in that by the way, police departments are too.
OP's opinion about police department corruption has nothing to do with the article about prison mail.
The majority of jails in the US are run by county sheriffs or local law enforcement. The majority of prisons are run by the states.
The mindset behind being a good cop and a good prison guard are totally different. Exposing hires to the corruption and violence inside prisons right before sending them to police the streets creates a very adversarial mindset against the public.