TREATY ESTABLISHING A SINGLE COUNCIL AND A SINGLE COMMISSION OF THE EUROPEAN COMMUNITIES, PROTOCOL ON THE PRIVILEGES AND IMMUNITIES OF THE EUROPEAN COMMUNITIES, CHAPTER III: MEMBERS OF THE ASSEMBLY, ARTICLE 9
Official Journal L 152 , 13/07/1967 P. 0014
++++ ARTICLE 9 MEMBERS OF THE ASSEMBLY SHALL NOT BE SUBJECT TO ANY FORM OF INQUIRY , DETENTION OR LEGAL PROCEEDINGS IN RESPECT OF OPINIONS EXPRESSED OR VOTES CAST BY THEM IN THE PERFORMANCE OF THEIR DUTIES .