Watching Prosecutor Park Sang-yong's interview video is shocking

‌A video from a few days ago.
He said even rookie prosecutors need to learn while investigating, and it takes about 5 years to become proficient. If you let rookie prosecutors investigate, they don't do well. (If even legal professionals/prosecutors are like this... then what about police investigators...)
That person, whether it's candidate Kim Ji-yong or whoever, is not someone who has conducted many investigations.
Prosecutors I know who have been to the CIO (presumably to be investigated or something similar) are dumbfounded and speechless at how they conduct investigations.
I looked at the interrogation protocols, and the CIO's level was on par with a rookie prosecutor. (And this is an investigative agency handling the most high-difficulty anti-corruption and high-ranking official investigations)
(In short, they are operating haphazardly, without a system, and are a complete mess)
Investigation isn't just about asking a bunch of questions like in the movies;
It must be connected through legal principles, so one must hit the core questions precisely.
Having undergone a police investigation, I noticed the police keep asking a series of general questions like you see in movies (media).
I actually corrected them, saying, "Asking those questions is useless, so ask them like this." (In short, police investigations fail to grasp the essence or the core, and their techniques themselves are lacking...)
-He was speaking roughly in this manner.
It truly feels like a disaster has struck.
What was impressive there
was that even a rookie public prosecutor doesn't know how to investigate well
and needs to be taught for about 5 years.
If even legal experts/public prosecutors are like this,
then of course investigators hired as police officers will lack investigative power when assigned to criminal cases.
Prosecutor Park Sang-yong also seemed skeptical about the Central Investigation Agency. He seems to view it as being unable to guarantee specialized investigative capabilities...