From an interview with Rabbi Chaim Dovid Zweibel, Agudas Yisroel, in Mishpacha Magazine, August 3, 2011, pages 30-31:
Q: What happens if there is a clash between the law of the land and the halachah? Does dina d’malchusa dina prevail?
A: I think those clashes will be few and far between. The secular law in New York State mandates you to make a report if you are on their list of categories and have “reasonable cause to suspect.” Under the guidelines of Rav Elyashiv shlita and other gedolim, raglayim I’davar comes mighty close to “reasonable cause to suspect.” They are so very close in my opinion, that I don’t envision frequent clashes between the secular law and the halachah. Where a conflict could arise would be in a case where a rav says not to report, but the person’s lawyer says he must. In that case, I suppose part of the process of the sh’eilah to a rav could also be where the person goes back to the ray and says, “You told me not to report, but my lawyer says I have to, so does that in any way affect your psak?” The moreh hora’ah will then have to decide how that fits in with the overall equation in determining his final answer to the sh’eilah.
Q: Wouldn’t the requirement to consult with rabbanim first delay the reporting process, thus leaving children at greater risk?
A: Under secular law you are required to report promptly according to the statute. Even under secular law, if an inexperienced pediatrician sees something that makes him nervous, he may wish to consult with a more experienced doctor. Senior law enforcement officials have told me that such a consultation does not conflict with the law. Where the process outlined by the gedolim under raglayim I’davar requires consulting with a rav first, a conflict might arise if that consultation would interfere with the immediacy of a report, but it should not delay the process any longer than the length of time it would take for two doctors to discuss the case between themselves.