So the commissioner in question would not be allowed any input into the case even though he had previously spoken in depth with JB about his case and come to the conclusion he was not guilty.
This is dealt with in sections 9 to 11 of Annex 5 of the CCRC Code of Conduct:
https://s3-eu-west-2.amazonaws.com/ccrc-prod-storage-1jdn5d1f6iq1l/uploads/2015/01/CCRC-_1873036-v2-Code_of_Conduct_April_2016_.pdfMy reading of the situation is that there is no bar to a legally-qualified Commissioner reviewing a case in which he had past involvement provided there is no conflict of interest, but he should consider whether his past involvement may also give rise to the perception of a conflict of interest, and if so, he should decline to participate in the review or, if already assigned, recuse himself from the reviewing committee.
In practice, I would be surprised if a CCRC commissioner who has previously had involvement in a particular case were to take part in reviewing that same case, even many years later, as I should have thought there is a clear basis for a perception of conflict that could undermine confidence in any decision taken.
I am not sure what the position would be about him bringing influence into discussions about a case, which is a different thing. Cases are reviewed by a Single Commissioner or reviewing committee of three Commissioners, who are named when the decision is issued, and I assume they must base their decisions on representations from the parties and any facts, information and evidence collected by the CCRC. Could evidence collected by the CCRC include facts, information and evidence within the cognisance of other commissioners? Or are commissioners expected to recuse themselves from fact-finding and evidence-collection by the CCRC, even when not participating in decisions?
I'm not sure of the answer to that, or even if there is a clear answer, but I suspect the answer is that a commissioner could render assistance to a CCRC investigation and a reviewing committee, even though he is not appointed himself. He would be doing so outside his strict capacity as a commissioner and subject to any continuing professional duties, especially confidentiality to the relevant client. In those circumstances, it would be considered down to the investigators, case officer and ultimately, the reviewing commissioners to bring everything together and exercise judgement about the various sources of information.