For this to work, the subject must remain oblivious to the fact that they are being ‘trained.’ This is accomplished by keeping them in a helpless victim state of mind with the use of trauma.
The entire method requires regular ritualistic abuse to keep the target in the victim state.
Declassified documents show how drugs and sensory overload are used to inflict trauma upon the public, but high-level slaves are often procured from families with an established history of child abuse.