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  1. The Halachah says (Rambam Rotzeach-uShmirat-Nefesh 11,5, read on to ch.13, interestingly haMechaber omitted those Halochos):

"הרבה דברים אסרו חכמים מפני שיש בהם סכנת נפשות.:"

"Our Sages forbade many matters because they involve a threat to life."

It is clear from Rambam, that our Sages of the Talmud defined "things that he considered dangerous" based both on their Torah AND empirical knowledge. Rambam followed the principle and added additional warnings based on his personal experience as a practicing physician and common knowledge of that time.

  1. The Poskim of our times, used the same approach when discussing the dangers of the 20th century (such as smoking), with some (Chofetz Chaim, Thitz Eliezer) clearly prohibiting it and some (R' Ovadia Yosef and R' Moshe Feinstein) finding ways to allow. They consulted the leading professionals to get an אמדנא of the danger.

  2. I heard a Shiur by a Rabbi in Jerusalem, that suggested, that since we all as a society (אנן סהדי) appoint special people responsible for setting the official definitions of "life threating" and not "life threating" situations in numerous areas, such as traffic laws, medicine, construction safety and many more, those laws can constitute the bar (אמדנא) for the Mitzvah of ונשמרתם.

Did some of the Poskim mention in their Shu"Ts relying on the federal laws and regulations (such as FDA for example), and do such directives create obligating אמנדא for שמירת הנםש Mitzvos?

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    How do you know that the DD"M regulations are because of danger to life? Maybe they are (just) to avoid injury. – Avrohom Yitzchok Jul 23 '18 at 21:09
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    I'm not sure what you mean by אנן סהדי? Also, why would halacha be affected by a non-halachic society's appointing of officials to determine acceptable danger levels? Ancient Roman society found it acceptable to have slaves battle lions... – Loewian Jul 23 '18 at 22:20
  • Crossing against a red light isn’t illegal in all states. Overeating and not exercising certainly isn’t illegal, and if it is, I’m moving to a different state. – DonielF Jul 24 '18 at 1:52
  • @AvrohomYitzchok I don't, they might be biased, I agree, but still, what's the אמדן for Venishmartem? – Al Berko Jul 24 '18 at 6:47
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    So why is DDM relevant? Certainly, a judicious government may make use of reasons that would also be relevant to halacha. But its actual specific enactments, or lack thereof, should be irrelevant to the determination of halachically acceptable risk. – Loewian Jul 24 '18 at 15:52

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