[T]he beit din must not allow rabbis of ordinary stature to rule on matters of great complexity or import (see Teshuvot Meishiv Davar 4:50). For example, the Noda Biy'hudah (vol. 2, Y.D. 88) criticizes an ordinary rabbi for ruling on a case of ro'eh machmat tashmish, a complex area of the laws of family purity that can potentially result in forcing a couple to divorce (see Shulchan Aruch, Yoreh Deah 187). Rav Moshe Feinstein (Teshuvot Igrot Moshe, Even Ha'ezer 1:64) similarly writes that ordinary rabbis should not rule on matters of contraception.[13]

[13] Regarding the pervasiveness of this problem in our generation, see Nishmat Avraham (4:13-16) and Rav Tzvi Gartner's essay in Tradition (32:3:94-95). See also Pitchei Teshuvah (Y.D. 99:6).