++++ 1 . FREE MOVEMENT OF PERSONS - EXCEPTIONS - EMPLOYMENT IN THE PUBLIC SERVICE - CONCEPT - RESEARCHERS ( EEC TREATY, ART . 48 ( 4 ) ) 2 . FREE MOVEMENT OF PERSONS - EXCEPTIONS - EMPLOYMENT IN THE PUBLIC SERVICE - ADMISSION OF NATIONALS ONLY TO POSTS INVOLVING PARTICIPATION IN THE EXERCISE OF POWERS CONFERRED BY PUBLIC LAW AND THE SAFEGUARDING OF THE GENERAL INTERESTS OF THE STATE - WHETHER PERMISSIBLE - EXCLUSION OF NATIONALS OF OTHER MEMBER STATES FROM EMPLOYMENT IN THE PUBLIC SECTOR GENERALLY - NOT PERMISSIBLE ( EEC TREATY, ART . 48 ( 4 ) ) 3 . FREE MOVEMENT OF PERSONS - EXCEPTIONS - EMPLOYMENT IN THE PUBLIC SERVICE - EXERCISE OF THE DEROGATION WAIVED BY A MEMBER STATE - CONSEQUENCES - PROHIBITION OF DISCRIMINATION ( EEC TREATY, ART . 48 ( 2 ) AND ( 4 )); REGULATION OF THE COUNCIL NO 1612/68, ART . 7 ( 1 ) AND ( 4 ) )