The New York Times just sent out an alert (here) with the following headline:
A Split From Trump Indicates That Flynn Is Moving to Cooperate With Mueller
The story includes this information about legal ethics:
... Defense lawyers frequently share information during investigations, but they must stop when doing so would pose a conflict of interest. It is unethical for lawyers to work together when one client is cooperating with prosecutors and another is still under investigation.
The notification alone does not prove that Mr. Flynn is cooperating with Mr. Mueller. Some lawyers withdraw from information-sharing arrangements as soon as they begin negotiating with prosecutors. And such negotiations sometimes fall apart. [Emphasis added.]
Do criminal defense lawyers abide by these restrictions? What are the consequences if they do not? Anyway, it's always good to see the Times talking about conflicts and ethics.