and that, as required, the rabbi can correctly apply his Talmudic and "Halakhic" knowledge to other areas (and where necessary refer complex cases to a "posek", a more qualified authority; see ). A "semikha" focusing on the laws of "Shabbat" is sometimes granted, similarly. Often, "niddah" will require a separate specialized certification, as an element of "shimush" pertains to these "halakhot". It is not uncommon for a rabbi to hold several certificates, with each "semikha" covering a specific area of "halakha".