The binding legal principles established are: (1) Under section 31H(1) of the Constitution, the President may exercise executive powers through Ministers to perform administrative acts that are incidental or ancillary to the exercise of constitutional powers, provided the Minister does not exercise the substantive power that the Constitution vests exclusively in the President. (2) 'Selection' under section 87(4) of the Constitution means making a final decision to choose tribunal members; it does not require the President to personally compare candidates or have detailed information about them, provided the President makes the ultimate choice and retains discretion to reject nominees. (3) Section 18(9) of the Constitution, which guarantees a fair hearing, applies only to proceedings before 'a court or other adjudicating authority' that determines civil rights or obligations, and does not apply to investigative tribunals whose function is to investigate and report facts without making binding determinations. (4) Evidence obtained illegally or in breach of constitutional rights is not automatically inadmissible; the admissibility is a matter for the tribunal or court's discretion, considering factors under section 48 of the Civil Evidence Act including the nature of illegality, probative value, interests of justice, and public interest.