> Not in the USA, since the 19th century but especially since Miranda v. Arizona
I'm not sure what you're trying to say here, because the problem did not abruptly vanish in 1966.
For example, Marty Tankleff, a then-teenager wrongfully convicted in 1990 for the murder of his parents. Even thought a defense lawyer arrived before Police lied to him that his father had named him as the attacker before falling unconscious, and even though a defense lawyer arrived before he could be tricked into signing a confession, the unsigned confession was still core to the prosecutions' case.
You were mentioning a boundary and line being drawn, I think what's trying to be said is that line is already drawn. No problem abruptly vanishes just because it becomes illegal. It doesn't help that your example is 30 years old,
police and police oversight have gotten far better since then.
The percentage of the population imprisoned or under some sort of parole has increased a lot in the last 30 years, either the police and the system they are part of has worsened, or the population has.
The statistics back you up. Violent crime in the USA is about what it was in early 70s, far below it's peak in the late 80s/early 90s. [Most of the decline seems to be linked to legalized abortion and elimination of leaded gasoline.]
I'm not sure what you're trying to say here, because the problem did not abruptly vanish in 1966.
For example, Marty Tankleff, a then-teenager wrongfully convicted in 1990 for the murder of his parents. Even thought a defense lawyer arrived before Police lied to him that his father had named him as the attacker before falling unconscious, and even though a defense lawyer arrived before he could be tricked into signing a confession, the unsigned confession was still core to the prosecutions' case.