Would this be useful for learning new languages as an adult? I have wondered if intelligence agencies used methods for heightening neuroplasticity in order to a

Would this be useful for learning new languages as an adult? I have wondered if intelligence agencies used methods for heightening neuroplasticity in order to allow adult agents-in-training to be able to achieve near-native fluency in new languages. Of course, there are probably some behavioral changes they would seek to make while their trainees were especially neuroplastic...