What is the test for subpoenaing privileged personal information of a witness in a civil proceeding?

The court concludes that there is a public interest in ensuring that persons reporting crimes, waste, mismanagement and wrongdoing be encouraged and protected in the performance of their civil duty. As was stated in People v. Hasson, 86 Misc.2d 781, 383 N.Y.S.2d 846, respecting the rights of witnesses:

"... the use of shotgun style judicial subpoenas to discover privileged ... information about the entire life of a potential witness and his family, whether from public agencies or private repositories, will find little favor with this court. Witnesses have rights in both criminal and civil proceedings. If every witness faced the prospect of having his entire privileged personal life examined by counsel and then paraded before the public, we would find ourselves looking long, hard and perhaps fruitlessly, for those who would shed light on the truth of controversies before the court." (People v. Hasson, supra, at 784-785, 383 N.Y.S.2d 846).