In a July 1989 BOE "Legal" letter, elders were told to call the Legal Dept. when an accusation of child abuse was made. Also, the Child Abuse Telememo secret form that I discovered in court documents in 2007 was printed at headquarters to begin to use beginning in July 1989 by an attorney in the Legal Dept to fill in when elders called in with an accusation of child abuse.
In 1991, the GB ordered that the Service Dept. share with the Legal Dept. any accusations that came into Service Desks about child abuse. Before that Service was keeping that info from Legal. Too many times up to that point, Legal found out about accusations of child abuse when a lawsuit was filed and that had to change.
If you want to learn when the instructions went into effect that JWs go to the elders rather than the authorities when "criminal" wrongdoing was committed by a JW, read the long, "boring" article that I wrote and posted on my website last year. This rule began to take form in 1968.
http://watchtowerdocuments.org/flawed-decree-conceals-criminals/