When do conflict of interest concerns kick in? I have a defense attorney who has filed a writ of habeas corpus for three codefendants. They have not been indicted as yet.

Even in a pretrial writ, I suppose the potential is there. The bases for relief should help define the nature of the risk.

Chip Wilkinson's Ethics Manual distributed free to every prosecutor in Texas is a wonderful resource on such ethical quandries and always the place I start.