I'm a student at YU and we were recently encouraged by our Roshei Yeshiva, including Rabbi Kenneth Brander, to undergo screening when JScreen came to our school. I an my fellow students felt very comfortable with JScreen's approach, credibility, and follow-up. Here is what he wrote:
We believe that all students should undergo genetic testing before marriage, preferably before dating or entering into a serious relationship. Testing gives you the knowledge to make informed decisions which can diminish pain and suffering within our community. YU Roshei Yeshiva encourage students to get tested and to speak to a trained genetic counselor and a knowledgeable halachic authority about any questions they may have.
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Rabbi Kenneth Brander