According to the article 58 of the Constitution, the court examines pleas concerning electoral violations or lack of legal qualifications of candidates.
If the Special Highest Court ascertains the incompatibility of the undertaken duties, the deputy loses their office "by operation of law".
This means that the unconstitutional legal provision still exists (it is not formally "null and void"), but it is expelled from the Greek "law and order".
This last "Special Court" is an ad hoc court, competent to judge alleged criminal acts of members of government (previous or in service), committed in their official capacity only (i.e. not common criminal or civil offenses committed in their personal capacity) and only when impeached by Parliament.
It is also competent to judge the President of the Republic, if impeached by Parliament for intentional violation of the Constitution or for high treason.
Up until the 2001 constitutional amendment, the Parliament appointed 3 MPs (plus three surrogates) to serve as prosecutors in the trial; they have now been replaced by a member of the Prosecution of Supreme Civil and Criminal Court of Greece (i.e. a professional prosecutor), ensuring Parliamentary disengagement and avoiding any potential political exploitation of the trial.