A trial court misdirects itself in law when it calls a witness mero motu (on its own motion) for the purpose of providing evidence that is crucial to the determination of the matter, where that witness is effectively a defence witness who should have been called by the accused to establish the veracity of their defence. When accused persons are found in possession of incriminating items and attribute ownership to a third party, it is their burden to call that third party as a witness, and the court should not intervene to close gaps in the defence case by calling such witness as a court witness. Leave to appeal under s 61 of the Magistrates Court Act should be granted where the Prosecutor General demonstrates that the intended appeal has reasonable prospects of success, is not hopeless or doomed to predictable dismissal, and raises either a point of law or shows that the acquittal was based on facts which could not reasonably be entertained.