Despite Miranda, they still know how to extract a false confession without leaving any marks. By the way, the verb “to extract” seems to be primarily used in the law enforcement and dental professions.
Ernesto Miranda, after being released from prison, was killed in a bar fight. Only one of the suspects was arrested. I presume that when the police arrested him, they read him his Miranda rights.
The only thing I’d quibble about is the ‘false’.
“It’s looking pretty bad for you at this point. I’m sure that you didn’t mean for it to turn out this way. Why don’t you tell us your side of the story. Maybe if you explain what really happened, we can figure something out.”
Then, when you type up the confession, put in a couple of mistakes. If the perp doesn’t pick up on them, point them out so the perp can make hand written corrections and initial them. That takes care of the ‘I didn’t read it. I just signed what they put in front of me and told me too.’
While ‘shut up and lawyer up’ is the smart thing to do, most criminals think that they can explain it away. And it will frequently get them a softer sentence for being cooperative.