Does anyone know if HaRav HaGaon Asher Weiss wears Techelet?
Also, why or why not?
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He does not wear techelet as he is not sure that the murex trunculus is the chilazon of the techelet. He does admit here that the chilazon is a snail.
He also says he doesn’t oppose anyone from wearing techelet as he explains there is no downside to wearing the murex trunculus.
He just thinks he has no obligation to wear it as there is a safek in his mind. He doesn't apply the concept of safek d’oraita l’chumrah even when there is a safek whether you did the mitzvah or not unlike the Shulchan Aruch.
He does not. He feels that archaeology cannot change a halacha and therefore we need not concern ourselves with the shaila. See Rabbi Aryeh Lebowitz here who address this: http://www.yutorah.org/sidebar/lecture.cfm/857737/rabbi-aryeh-lebowitz/ten-minute-halacha-why-do-so-many-gedolim-still-not-wear-techeiles-/