In Declaration No 21 on the protection of personal data in the fields of judicial cooperation in criminal matters and police cooperation, annexed to the final act of the intergovernmental conference which adopted the Treaty of Lisbon, the conference acknowledged that specific rules on the protection of personal data and on the free movement of personal data in the fields of judicial cooperation in criminal matters and police cooperation based on Article 16 TFEU could prove necessary because of the specific nature of those fields.
I nDearbhú Uimh. 21 maidir le sonraí pearsanta a chosaint i réimse an chomhair bhreithiúnaigh in ábhair choiriúla agus an chomhair póilíneachta, atá i gceangal le hionstraim chríochnaitheach na comhdhála idir-rialtasaí a ghlac Conradh Liospóin, d’admhaigh an chomhdháil go bhféadfadh gá a bheith le rialacha sonracha maidir le sonraí pearsanta a chosaint agus le saorghluaiseacht sonraí pearsanta i réimse an chomhair bhreithiúnaigh in ábhair choiriúla agus an chomhair póilíneachta bunaithe ar Airteagal 16 CFAE mar gheall ar chineál sonrach an réimse sin.