Kayani, J. and Sharif, J. observed that “Prohibition is appropriate only where it is intended to restrain a tribunal which assumes or threatens to assume a jurisdiction which it does not possess, so long as there is something in the proceedings left to prohibit. Here, the proceedings are already exhausted. Mandamus tribunal is issued to compel a tribunal or other authority to exercise a jurisdiction which it possesses but decline to exercise, or to do some particular thing which appertains to his office and which is in the nature of a public duty.
There is no such thing to be done here. Certiorari will be appropriate to quash the decision of a tribunal which has assumed a jurisdiction that it does not possess, or where bias by interest or want of good faith is alleged, or where there is a breach of the rules of natural justice or where there is fraud and perjury.
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