I have read that forensic evidence can be counted as one of the two required "witnesses" for child abuse cases, however have not seen anything in writing to support this.
The wikipedia article at https://en.wikipedia.org/wiki/Jehovah's_Witnesses'_handling_of_child_sex_abuse states:
DNA evidence, medical reports, or information from forensic experts or police that proves sexual abuse is also accepted as a valid "second witness", however critics argue that, without mandatory reporting for all accusations of abuse regardless of the local laws, such evidence could remain undetected.
There is no citation provided. Does anyone have a reference to support that forensic evidence can be used by elders as a witness?