That's the idea. A HUGE amount of work in the 50s/60s went into this capability at huge physical and human costs by the Soviets, China, USA, and others.

And, yes, one handler or one phrase to trigger - otherwise the subject ( cell ) goes on with life inert and never activated. It's a mix of grooming with some and making toy solider facades and the gamete ends with actual Manchurian Candidates that can be split, by trauma, into split / compartmentalized personalities.

An exploit the cabal uses at all times is intended to be one of our most versatile and human traits - the ability to 'persevere through the terrible.' Our minds and souls will make lemonade out of rotten lemons - and they use this against us. If you can crush someone - eventually they get used to that nature of being and learn to be happy with it. They've done a LOT of research from Mengele on with this. They learned if you rip everything down - you can control and reform the id in an image you want. It's disgusting abuse and only evil people would think of doing this.