Digital media overcomes the authors points
Recorded interviews would, until redacted, show the lies that agents use just like every cop out there
The Reid Technique is a variation on Good Cop Bad Cop without the bad cop.
Basically the 'Good Cop' appears to be empathetic to the plight of the suspect to gain his trust.
Once trust is established the suspect lets his guard down and beings to speak freely as if to a friend.
The suspect can be led to confess.
The problem is the cop can then trick an innocent suspect to confess by telling them if they just sign a confession, everything will be cleared up later. This is how the police get innocent and naive people to confess to crimes they didn't commit.
If you want to see how innocent people can be led to confess to a crime they didn't commit, track down PBS FRONTLINE: "The Confessions".
The Reid technique is a method of interrogation. The psychological system was developed in the United States by John E. Reid in the 1950s, who was a psychologist, polygraph expert and former Chicago police officer. Proponents of the Reid technique say it is useful in extracting information from otherwise unwilling suspects. But critics say the technique results in an unacceptably high rate of false confessions, especially from juveniles.
A smaller than phone size digital recorder as you say blows the FBI’s excuses away. If I can’t record MY copy of an FBI interview there is no interview. They have shown with the 2016 election and it’s aftermath they are corrupt and dirty cops. If they’ll try a coup against a duly elected president what won’t they do to John Q.Public to get a conviction. Federal law enforcement can’t be trusted at this point from the courtroom, to the Oval Office to even their press conferences. They are dirty and they did it to themselves.