The world is littered with JW's and former JW's whose lives and family lineage was ruined or forever altered at the hands of "unlettered and ordinary" Janitors, Carpenters and Window Washers masquerading as Bible Theologians and playing detective because they given the authority to deal with complex matters that even trained professionals wouldn't dare to handle on their own.
There was a teenager in my congregation who in hindsight was exhibiting signs of schizophrenia. Two elders were dispatched to investigate. They determined he was under the influence of spiritism because he would hear voices telling him to kill his mother.
These two elders, one a construction worker and the other a low-level municipal employee who was illiterate until he became a JW, prayed with the family and helped them conduct a spring cleaning where they threw away any items purchased second hand at garage sales and the like.
I lost touch with that family a few years afterward, so I don't know what ever became of that kid. Needless to say, it could have very easily resulted in a tragic ending. No professionals were ever engaged to my knowledge.