The rules of the Court are silent as to the procedure for the objection to an expert or a witness
(Peter Joseph Chacha v The United Republic of Tanzania, application 003/2012, judgment,
28 March 2014 para 84). No conditions or time-limits have been laid in the Rules of
Procedure (Chacha v Tanzania para 84). As such, a party may raise an objection at any stage
of the proceedings. A separate opinion by Ngoepe J however questionned whether a witness
could be dismissed as a non-expert, before the witness is given the opportunity to qualify on
the basis of a curriculum vitae alone.
The admission of a contested expert witness is subject to the ruling of the Court following
oral submissions by the parties (Chacha v Tanzania).
The appointment of an expert witness falls squarely within the discretion of the Court
(Chacha v Tanzania para 87).
The main qualities of an expert witness include sufficient knowledge of the subject-matter,
independence and impartiality towards the parties in carrying out the duties (Chacha v
Tanzania para 88).
The mere fact that the statement of an expert witness contain elements in favour of the
arguments of applicant do not in itself amount to bias, leading to the disqualification of the
expert. (Chahcha v Tanzania).