What do you do, if anything, if your client confesses to a crime for which he is not charged, but someone else is, or where someone else has already been convicted. Not a common practice in the military, or is it. What about the multi-accused drug case for example?
Here’s an interesting article about the potential ethics of that “problem.” Professor Coline Miller posts about: Jean Fleming Powers’ Comparing Exceptions to Privilege and Confidentiality Relating to Crime, Fraud, and Harm—Can Hard Cases Make Good Law?
Professor Miller concludes that there is a reason to avoid the client-attorney privilege in such a case if there is (substantial?) harm to the other client. Based on his argument his point is limited to the convicted person, not the one on trial and not yet convicted.