The following legal framework adopted by the Council of Europe is relevant to the activities conducted by the Investigation Division of the DIO.

• Charter of the Directorate of Internal Oversight
• Staff Regulations and staff rules (entered into force on 1 January 2023) and secondary legislation for its implementation
• Rule on investigations (entered into force on 1 January 2023)
• Speak Up: Council of Europe Policy on reporting wrongdoing and protection from retaliation (entered into force on 1 June 2023)
• Code of conduct 
• Policy on Respect and Dignity in the Council of Europe