Conflicts of Interest
From Criminal Defense Wiki
Background
It is crucial that the defense attorney is dilligent and zealous in advocating on behalf of her client. Any conflict of interest that creates an incentive for the defense attorney to undertake representation that is anything less than zealous should be avoided. Conflicts of Interest are often analyzed by examining whether the conflict would harm the defendant's right to counsel.
If the criminel defense attorney represents a client and the defense attorney has an existing conflict of interest, the client may later have an action against the attorney for malpractice or ineffective assistance of counsel
See Ethics and Professional Responsibility