The short answer is that this is almost never done, and for good reason. Representing more than one defendant in the same case creates a conflict-of-interest risk so serious that the ethical rules strongly steer lawyers away from it. In criminal matters especially, co-defendants ordinarily get separate counsel. Understanding why explains the rule.
The core problem: divided loyalty
A lawyer owes each client undivided loyalty. When one lawyer represents two defendants in the same case, that loyalty is immediately at risk, because the defendants’ interests frequently diverge:
- Their accounts of events may differ or contradict.
- One may have a viable defense that points at the other.
- They may have different plea or cooperation options, where helping one means hurting the other.
Any of these pulls the lawyer in two directions at once, which is precisely what the duty of loyalty forbids.
What the ethics rules say
Under the conflict-of-interest rule (Rule 1.7), the potential for conflict in representing multiple defendants in a criminal case is considered so grave that ordinarily a lawyer should decline to represent more than one co-defendant. Commentary on the rule goes further, noting it is almost impossible to provide joint representation in criminal matters without running afoul of the loyalty duty. So while joint representation is not banned by a single flat prohibition, the rules treat it as something to avoid.
The safeguards
The system adds protections around this risk:
- Court inquiry. In a criminal case, the court generally inquires when a lawyer represents multiple defendants, to ensure the accused understand the risk and that representation is appropriate.
- Separate counsel as the norm. The practical result is that each co-defendant typically receives their own counsel, preserving each one’s undivided advocacy.
These safeguards exist because the right to conflict-free representation is fundamental.
Consider two co-accused whose accounts point at each other: one lawyer cannot represent both, because the divergent interests make undivided loyalty impossible, so each receives separate counsel.
The practical upshot is that one lawyer for multiple co-defendants collides with the duty of undivided loyalty. Because their interests so often diverge, in testimony, defenses, and plea options, the rules strongly disfavor joint representation, courts scrutinize it, and the norm is separate counsel for each defendant.
Frequently Asked Questions
Why can’t one lawyer usually represent two co-defendants?
Because a lawyer owes each client undivided loyalty, and co-defendants’ interests often diverge, in their accounts, their defenses, or their plea options, creating a conflict the loyalty duty forbids.
Is joint representation of co-defendants flatly prohibited?
Not by a single absolute ban, but the rules treat the conflict risk as so grave that a lawyer ordinarily should decline, and commentary notes it is almost impossible to do in criminal matters without violating the rules.
What protects a defendant from a conflicted lawyer?
Courts generally inquire when one lawyer represents multiple defendants in a criminal case, and the usual result is that each co-defendant receives separate counsel.
This article is general information about conflicts in joint representation. It is not legal advice and does not create an attorney-client relationship. Application is fact-specific and the rules can change. Specific questions should be directed to qualified counsel.
Sources
- <a href="https://www.americanbar.org/groups/professionalresponsibility/publications/modelrulesofprofessionalconduct/rule17conflictofinterestcurrentclients/”>American Bar Association, Model Rule 1.7: Conflict of Interest: Current Clients
- <a href="https://www.americanbar.org/groups/professionalresponsibility/publications/modelrulesofprofessionalconduct/rule17conflictofinterestcurrentclients/commentonrule17/”>American Bar Association, Model Rule 1.7: Comment
- Army Publishing Directorate, Army Regulation 27-26 (Rules of Professional Conduct for Lawyers)