Confessions are an integral part of any civilized melting pot justice system.

A good way of understanding a culture’s stance towards crime is to study their stance towards individual development.

Buddhism is famously tolerant, for example, while Christianity is generally considered more punitive. Buddha forgives you now, Jesus will forgive you later.

Confessions ultimately reflect an aspect of development.

Milarepa is a famous legendary character in Tibetan Buddhism while Jesus is the legendary leader of Christians. Both characters are generally considered fictional by outsiders, but they reflect real developmental steps.

Milarepa was a major criminal who developed into a philosophical type, and his development is described in his legend. Jesus likewise developed into a philosophical type but the details are obscure, aside from the Christian Apocrypha writings.

https://en.wikipedia.org/wiki/New_Testament_apocrypha 

So Milarepa and traditions of his followers are more practically useful in examining the developmental process because their tradition does not discourage studying that.

The origin or root of a confession is simply the realization that a mistake was made.

If a person eats a certain food and starts vomiting, they realize usually by themself that they made a mistake, and they learn to be more discriminating about what they eat.

But suppose a small child kept eating food that caused vomiting. Some people would a) let the kid learn even though they have to clean up a bit. Others would b) force the child to learn more quickly.

Either way will lead to less vomiting, but ‘b’ causes the child to externalize responsibility. In other words ‘simple learning’ becomes something more complex requiring teachers and other things such as confessions.

The first method ‘a’ will lead to smarter and quick learning people, but it also leads to more dead children and various other natural prices. 

As a general rule, more traditional societies will focus on the individual.

Their goal is to develop the individual properly with the expectation that this will lead to broader society developing properly.

A melting pot society obviously can’t do that though. There is only unproductive anarchy, accelerating violence, when several traditional groups are thrown together and forced to allow each groups youth to learn without judgment i.e., externalizing responsibility.

Thus, in places like the United States, you will find most people educated to externalize responsibility, including requiring ‘proof’ that a person has developed to a certain point such as confessions, diplomas etc.

As the people involved in these societies get slower and slower, they begin to substitute the external proof for the original substance. A diploma becomes a substitute for learning academics, a confession becomes a substitute for some moral development.

But then, if the society continues degrading, eventually the original purpose of the externalized proof is not even connected to the original thing it was supposed to symbolize. 

In this case a) Western melting pot legal systems developed to incorporate ‘a confession’ as evidence of development, thus both an acknowledgement of responsibility and a mitigation of the need for involvement by the melting pot, i.e., person confessed? They do not need to be punished.

b) As the melting pot crystallizes this first step would either become less and less visible i.e., the ‘melting pot is ‘becoming an indigenous society’, or it would become more and more visible i.e., the melting pot is fracturing.

c) In this case, a ‘confession’ was gotten that has no resemblance to a confession. Esar Met was not contemplating some past action when he realized that he made a mistake. He was overpowered by a group of very simple thugs who were determined to get him to pretend that he realized the error of a specific act which he in fact was not even involved with.

In a melting pot there is always an ‘emergency need’ for techniques which shortcut normal indigenous steps.

In this case, the U.S. legal system is a sort of corporate entity.

It’s goal is to force several competing traditional societies to integrate.

Thousands of years ago this worked smoothly, and the U.S. is perfectly geared to having extraordinary lasting success if it is thousands of years ago, but it’s not.

There are competing indigenous viewpoints easily available to anybody, things which will disprove any of the ‘necessary’ fictions of the melting pot, i.e., books, the internet, etc. 

So gradually melting pots struggle to survive the cyclical return to increasing indigenous power through various charades.

In this case, a person with a diploma calculated that if he or she could get a faster confession then it would improve the legal system.

How do you get a faster confession?

The signature of a melting pot is that children are encouraged to be deceptive in matters that correspond respectively to the melting pots deception of their indigenous parts, to lie and use force to get one individual to ‘join’ a group of individuals. This is overtly discouraged in adults of course, even if it is covertly necessary.

So if you want to solve the problem of ‘getting more confessions so you can improve the legal system’, the best first path is to look at how experts, melting pot children, do it.

Anybody can look at the specific steps in the Reid Technique and see that they are not some master psychological step, they are simply a copy of what poorly raised children do.

Somebody with a diploma they shouldn’t have had, solved a problem they didn’t understand, but they did it in America, so they made a lot of money doing it.

https://people.howstuffworks.com/police-interrogation.htm#pt1 

https://en.wikipedia.org/wiki/Reid_technique