THe question about the baby switch made me think of this question:
In the realm of Issurim (Arayos, Mamzerim, conversion, Kohen, etc) when new evidence arises, is a Beis Din and what Beis Din obligated to judge and decide on it?
For example in the aforementioned case, a DNA report comes from a lab 20 year after the birth showing with a 99% probability that the babies were switched. The two persons enjoy their current Chazokos (maybe already married with kids). What's next - what B"D is obligated/authorized to see the case?
Can a Beis Din deny seeing new evidence? And is it different for different Issurim topics?