I have a feeling that DNA evidence that proves guilt would generally be used after they have called the society for directions.
The elders would probably insist that the brother come clean or would simply DF or even DA him when he goes to jail.
Here is their present policy:
http://www.jw-media.org/aboutjw/article23.htm
I can't quote, as it's copyrighted!
Allow me to paraphrase.
Two elders meet separately with the accused abuser and the accuser (victim). If the accused denies the charge, the two elders may arrange for him and the victim to restate their position in each other’s presence, with elders also there.
An absolutely horrid experience for young Johnny or Suzy to have to be put through. "Well, he denies it so say to his face what you said he did." They really need to consult experts before putting a child through that.
If the accused still denies the charges and there are no other witnesses who can substantiate them, the elders cannot take action within the congregation at that time.
They cannot warn people or nothing.
Even if the elders cannot take congregational action, they are expected to report the allegation to the branch office of Jehovah's Witnesses in their country, if local privacy laws permit.
....or call secretly if the laws do not permit. Call the WTS first and foremost to protect their interests ahead of the victim's interests.
The elders may be required by law to report even uncorroborated or unsubstantiated allegations to the authorities. If so, the elders receive proper legal direction to ensure that they comply with the law.
No more, no less. Comply with the barest minimal requirements of the law.
If the accused confesses that he is guilty of child abuse, the elders take appropriate congregational action. If he is not repentant, he will not be permitted to remain a member of the congregation. Even if he is repentant, he would not qualify for suck-ass positions such as M.S., elder, Pioneer.
And of course, that's the most important thing-that they determine his qualifications for suck-ass positions. Much higher priority than protecting the children.
In a few instances, individuals guilty of an act of child abuse have been appointed to positions within the congregation if their conduct has been otherwise exemplary for decades. All the factors are considered carefully. Suppose, for example, that a long time ago an 18-year-old male had sexual relations with a 15-year-old girl who was a willing participant. Depending upon the U.S. jurisdiction where he lived when this happened, elders may have been required to report this as an incident of child abuse. Let us say that 20 years have passed. He has been living an exemplary life and he is respected. In such a case, the man could possibly be appointed to a responsible position within the congregation.
They throw in one sort of REASONABLE example in case some serious suck-asses manage to be appointed in some pretty unreasonable situations. They can say this was just an example.