Lothian and Borders Police, who conducted the Sheridan inquiry, have also been asked to investigate why Rosary beads were taken from Mrs Sheridan during a police interview after a complaint from a member of the public.
Questions have been raised at Holyrood over how recordings of Tommy and Gail Sheridan being interrogated by police officers were leaked to the BBC.
Lothian and Borders Police, who conducted the Sheridan inquiry, have also been asked to investigate why Rosary beads were taken from Mrs Sheridan during a police interview after a complaint from a member of the public.