"In a government of laws, existence of the government will be imperiled if it fails to observe the law scrupulously. Our Government is the potent, the omnipresent teacher. For good or for ill, it teaches the whole people by its example. Crime is contagious. If the Government becomes a lawbreaker, it breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy. To declare that, in the administration of the criminal law, the end justifies the means -- to declare that the Government may commit crimes in order to secure the conviction of a private criminal -- would bring terrible retribution. Against that pernicious doctrine this Court should resolutely set its face."Mr. Justice Brandeis in Olmstead vs. United States of course it's a dissent. But then Marshall did quote him in a majority opinion. But they were talking about defending the rights of bootleggers and murderers because its only when you protect the rights of the most despised that the rights of the rest of us are protected.
Lovely language, but I do not think that our current rulers think that way. Do you?