Islamic Law & Judiciary

Assalamu ‘alaykum wa rahmatullahi wa barakatuhu Mufti Sahab, A sister asks: “I would like to know if it’s permissible or haram to record someone’s speech and opinions in order to use them against him as a proof in a law court (Italian civil one, not Islamic court)?” Jazakallahu khayran, Wassalam

Assalamualaykum,   I am doing research and wanted to know how a murtad would be dealt with in an Islamic state? Please list all steps