Article 42 of the Treaty on European Union requires the unanimityof all members of the Council of the European Union, i.e. all Member States, for the adoption of any decision to apply the provisions of Title IVof the Treaty establishing the European Community on visas, asylum, immigration and other policies related tofree movement of persons to action in areas referred to in Article29.
Éilíonn Airteagal42 den Chonradh ar an Aontas Eorpach aontoilíocht chomhaltaí uile Chomhairle an Aontais Eorpaigh, i.e. na Ballstáit go léir, chun aon chinneadh a ghlacadh chun forálacha Theideal IVden Chonradh ag bunú an Chomhphobail Eorpaighmaidir le víosaí, tearmann, inimirce agus beartais eile a bhaineannle saorghluaiseacht daoine a chur i bhfeidhm ar an ngníomhaíochtsna réimsí dá dtagraítear in Airteagal29.