Commenting on why it has taken the United States so long to apply "the privilege against self-incrimination and the right to counsel to the proceedings in the stationhouse as well as to those in the courtroom" - as the Supreme Court did in Miranda v. Arizona - this author notes that, "To a large extent this is so because here, as elsewhere, there has been a wide gap between the principles to which we aspire and the practices we actually employ."
Kamisar, Yale. "The Citizen On Trial: The New Confession Rules." Current Hist. 53, no. 312 (1967): 76-81, 114.