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Disqualifications for membership of courts-martial and for acting as judge-advocate. 
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191.—(1) An officer who convenes a court-martial shall not sit on that court-martial. 
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(2) None of the following persons shall be qualified to serve as a member of, or to act as judge-advocate at, any court-martial, that is to say:— 
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(a) an officer who has examined into or advised on the matters on which the charge against the accused is based, 
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(b) the prosecuting officer, 
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(c) an officer who is a witness for the prosecution, 
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(d) any officer who investigated the charge against the accused or took down any summary or abstract of evidence in the case, or who was a member of a court of inquiry respecting the matters on which the charge against the accused is based, 
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(e) the commanding officer of the accused, 
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(f) any officer who has a personal interest in the case, 
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(g) any officer who is not for the time being subject to military law, 
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(h) an officer who, in an advisory capacity, dealt with the charges to be tried by the court-martial or the evidence to be produced at the court-martial or the conduct of the prosecution at the court-martial. 
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