Under Rule 3(2), until such time as her credentials had been verified or a ruling had been given on any dispute, and provided that she had previously made a written declaration stating that she did not hold any office incompatible with that of Member of the European Parliament, Emer Costello would take her seat in Parliament and on its bodies and would enjoy all the rights attaching thereto.
Saskaņā ar Reglamenta 3. panta 2. punktu, kamēr Emer Costello pilnvaras nav pārbaudītas vai kamēr nav pieņemts lēmums par strīdīgu jautājumu un ar noteikumu, ka viņa pirms tam ir parakstījusi rakstisku deklarāciju, ka neieņem nevienu ar Eiropas Parlamenta deputāta pienākumu pildīšanu nesavienojamu amatu, viņa darbojas Parlamentā un tā struktūrvienībās un uz viņu attiecas visas ar šo darbību saistītās tiesības.