Pádraig Ó Céidigh (Independent) | Oireachtas source

I have a brief question about the common travel area. Is the fingerprinting requirement there already? Is it something new that has been brought in? How is it relevant to the whole area of Brexit? I cannot get the connection between the fingerprinting requirement and Brexit. This Bill provides that the "Minister or an immigration officer, where he or she considers it necessary for the purpose of ensuring the integrity of the immigration system ... relating to the Common Travel Area, may take or cause to be taken the fingerprints of a person for the purpose of the person’s application for an Irish visa or an Irish transit visa". I just want to understand this provision. Does a fingerprinting opportunity or facility already exist ? Is this something new? How has it been triggered by Brexit?