Margaret Singer, pioneer in the study of cults, chaired the Alberta Psychological Association (APA) Task force on Deceptive and Indirect Methods of Persuasion and Control (DIMPAC) from 1983-1987. The final report of this task force was rejected by the APA, and has not been published. The APA noted that the brief characterized the theory of brainwashing as not scientifically proven and lacking scientific and methodological rigor.
The APA has since dismissed the use of the word "cult" and switched to the term "new religious movements". This study of new movements focuses on how our society reacts to these new influences and I think, does not distinguish those groups that use coercive methods to recruit and retain members.
I don't think the use of coercive methods has been seriously studied since. One must wonder also if an ethical study could be performed, considering how badly these experiments can go wrong. (Stanford prison experiment - Zimbardo).
I think the court system, which bases freedom on our ability to make up our own minds (free will), does not want to consider how often our choices are influenced by outside forces. What are we if we only have the illusion of free will? Automatons? If we are so easily coerced, how can any criminal be found guilty? He was captivated by undue influence.
In defence of academia's stance, Loftland lived with and studied the Unification Church in the sixties and noted that the recruitment efforts were largely ineffective (sound familiar)? If brainwashing were so large an influence in our lives, shouldn't such activities have a more effective recruitment rate? (Becoming a World-Saver...", Loftland).