A criminal defense lawyer’s duties to the client and to the court run on two tracks at once: fierce loyalty to the person they represent, and honest participation in the system that will decide the case. The client is owed competence, communication, loyalty, and confidentiality. The court is owed honesty and fair dealing. Most of the time these obligations sit comfortably together. When they collide, the ethical rules decide which one gives way, and knowing those rules is the difference between understanding what your lawyer is doing and feeling blindsided by it.
Who Decides What in Your Case
One of the most misunderstood parts of the relationship is figuring out who controls which decisions. Under the ABA Model Rules, the client sets the objectives and the lawyer handles the strategy. The client decides whether to settle, what plea to enter, whether to waive a jury trial, and whether to testify.1American Bar Association. Rule 1.2: Scope of Representation and Allocation of Authority Between Client and Lawyer Those belong to the client even if the lawyer thinks the decision is unwise.
The lawyer controls the tactical side: which witnesses to call, what motions to file, how to cross-examine, and what legal arguments to raise. A client cannot dictate trial strategy the way they can dictate a plea. The division matters because clients sometimes feel steamrolled by their own attorneys, and lawyers sometimes feel handcuffed by a client’s bad choices. The rules draw the line so both sides know their lane.
There is one hard limit on the partnership. A defense lawyer cannot help a client commit a crime or carry out fraud. The lawyer may explain the legal consequences of any proposed course of action, but actively assisting illegal conduct is off the table regardless of what the client wants.1American Bar Association. Rule 1.2: Scope of Representation and Allocation of Authority Between Client and Lawyer
What the Lawyer Owes the Client
Competence and Diligence
A defense lawyer must bring the legal knowledge, skill, and preparation the case reasonably demands.2American Bar Association. Model Rules of Professional Conduct Rule 1.1 Competence A tax attorney who agrees to handle a complex murder trial without the necessary criminal law background is violating this rule before the first hearing. Competence can be acquired through study and preparation, so the rule does not require deep expertise from day one, but it does require honest self-assessment about whether the lawyer can get up to speed in time.
Closely related is diligence: a lawyer must act with reasonable promptness.3American Bar Association. Rule 1.3: Diligence Missed filing deadlines, ignored cases, and expired statutes of limitations generate the most disciplinary complaints. A competent lawyer who sits on their hands is still failing the client.
Communication
Clients are entitled to know what is happening in their case. The lawyer must keep the client reasonably informed and respond promptly to requests for information.4American Bar Association. Model Rules of Professional Conduct Rule 1.4 Communications Beyond status updates, the lawyer must explain things well enough for the client to make informed decisions, particularly the big ones like whether to accept a plea or testify. A client kept in the dark cannot exercise the authority the rules reserve for them.
Conflicts of Interest
A defense lawyer cannot represent a client if doing so creates a conflict with another client, a former client, or the lawyer’s own interests. The rule targets two scenarios: the lawyer’s work for one client is directly adverse to another, or outside responsibilities create a serious risk of limiting the quality of representation.5American Bar Association. Model Rules of Professional Conduct Rule 1.7 – Conflict of Interest: Current Clients The classic example is two co-defendants hiring the same lawyer when their best strategies are to blame each other. That lawyer cannot effectively advocate for both. Some conflicts can be waived with informed consent, but many in criminal defense cannot.
Confidentiality and Its Limits
Confidentiality is the bedrock that makes the entire relationship work. If clients feared their lawyer might repeat what they said, no one would tell their attorney the truth, and no lawyer could mount an effective defense. Under the rules, a lawyer cannot reveal any information related to the representation unless the client consents or disclosure is impliedly necessary to carry out the work.6American Bar Association. Model Rules of Professional Conduct – Rule 1.6: Confidentiality of Information The protection covers everything the lawyer learns in connection with the case, not just what the client says directly.
Confidentiality is not the same thing as attorney-client privilege. Privilege is a narrower evidentiary rule that prevents a court from forcing a lawyer to disclose private communications made for the purpose of getting legal advice. The ethical duty of confidentiality is broader: it applies at all times, covers information from any source connected to the representation, and survives even if privilege is waived. A communication might lose its privileged status if the client shares it with a third party, but the lawyer’s ethical obligation to keep it quiet remains.
The duty is broad, but not absolute. A lawyer may disclose confidential information to prevent reasonably certain death or serious physical harm, to prevent a client from committing a crime or fraud that would cause substantial financial harm when the client has used the lawyer’s services in the scheme, or to comply with a court order.6American Bar Association. Model Rules of Professional Conduct – Rule 1.6: Confidentiality of Information A lawyer may also reveal confidential information to the extent necessary to defend against a malpractice claim or disciplinary charge brought by the client.
Protection kicks in before you even hire the lawyer. Someone who consults an attorney about possible representation is a prospective client, and any information shared during that consultation is protected. The lawyer cannot use or reveal it, even if the person goes elsewhere.7American Bar Association. Rule 1.18: Duties to Prospective Client
What If the Client Is Guilty, Or Wants to Lie
The answer surprises many: a defense lawyer who knows the client is guilty can still defend the case. The lawyer’s job is not to determine guilt or innocence. It is to hold the government to its burden of proof, challenge weak evidence, ensure proper procedures were followed, and protect the client’s constitutional rights. A defense lawyer for someone who has admitted guilt can still cross-examine prosecution witnesses, argue the evidence is insufficient, and file motions to suppress improperly obtained evidence. The system places the burden on the government, and the defense lawyer’s role is to test it.
What the lawyer cannot do is help the client lie. If the client insists on taking the stand and testifying falsely, the lawyer faces one of the hardest ethical dilemmas in practice. The rules on candor toward the court prohibit a lawyer from offering evidence they know to be false.8American Bar Association. Model Rules of Professional Conduct – Rule 3.3 Candor Toward the Tribunal That means the lawyer cannot put the client on the stand, walk them through rehearsed false testimony, and then argue that testimony to the jury. Jurisdictions handle the mechanics differently, but the consensus is clear: defending someone is not the same as helping them deceive the court.
What the Lawyer Owes the Court and the Other Side
Honesty With the Court
Defense lawyers are officers of the court, and that title carries real obligations. A lawyer cannot knowingly make a false statement of fact or law to a judge, and must correct any prior false statement that turns out to be material. If a lawyer discovers that evidence they presented is false, they must take reasonable remedial steps, which can include telling the court. The most counterintuitive requirement: if the lawyer knows of legal authority in the controlling jurisdiction that directly undermines their client’s position, and opposing counsel has not raised it, the lawyer must disclose it.8American Bar Association. Model Rules of Professional Conduct – Rule 3.3 Candor Toward the Tribunal The lawyer can still argue why that authority should not control, but they cannot hide it.
Fairness to the Other Side
Aggressive advocacy does not mean anything goes. A defense lawyer cannot tamper with evidence, obstruct the opposing party’s access to evidence, or coach a witness to lie. When the prosecution makes a proper discovery request, the defense must make a reasonably diligent effort to comply.9American Bar Association. Model Rules of Professional Conduct – Rule 3.4 Fairness to Opposing Party and Counsel The line between hard-nosed defense work and obstruction is not always obvious from the outside, but the rules draw it clearly for the lawyers involved.
Public Statements About the Case
In high-profile cases, defense lawyers face restrictions on what they can say to the media. A lawyer involved in a case cannot make public statements they know or should know would have a substantial likelihood of prejudicing the proceeding.10American Bar Association. Rule 3.6: Trial Publicity They can confirm basic facts like the identity of the accused, the charges, and scheduling. Going on television to argue the merits before trial risks crossing the line.
Fees and Client Money
Defense lawyers cannot charge unreasonable fees. Reasonableness depends on factors like the time and labor involved, the difficulty of the legal issues, the customary fee in the area for similar work, the results obtained, and the lawyer’s experience and reputation.11American Bar Association. Rule 1.5: Fees A lawyer charging ten times the local rate for a routine misdemeanor would have a hard time justifying the bill.
When a lawyer holds a client’s money or property, it must be kept in a separate trust account, apart from the lawyer’s personal or business funds.12American Bar Association. Rule 1.15: Safekeeping Property Fees paid in advance go into the trust account and can only be withdrawn as they are earned. When the lawyer receives funds in which the client has an interest, the client must be promptly notified and paid what they are owed. Mixing client funds with personal funds, sometimes called commingling, is one of the fastest routes to disciplinary action in the profession.
Ending the Relationship
A client can fire their defense lawyer at any time, for any reason. From the lawyer’s side, the picture is more complicated. Some situations require withdrawal: if continuing would force the lawyer to violate ethical rules or the law, if the lawyer’s physical or mental condition prevents competent representation, or if the client insists on using the lawyer’s services to commit a crime or fraud.13American Bar Association. Rule 1.16: Declining or Terminating Representation
Other situations give the lawyer the option to withdraw without requiring it: when the client refuses to pay, makes the representation unreasonably difficult, or insists on a course of action the lawyer finds deeply objectionable.13American Bar Association. Rule 1.16: Declining or Terminating Representation If the matter is before a court, the lawyer generally needs the judge’s permission to step away. Courts routinely deny withdrawal requests when the timing would harm the defendant or disrupt the proceedings.
What You Can Do If a Defense Lawyer Falls Short
Professional Discipline
Violating the ethical rules, committing a crime that reflects on the lawyer’s honesty or fitness, engaging in dishonesty or fraud, or acting in a way prejudicial to the administration of justice all constitute professional misconduct.14American Bar Association. Rule 8.4: Misconduct Sanctions range in severity. An admonition is a private declaration that the conduct was improper. A reprimand is a public version of the same. Suspension removes the lawyer from practice for a set period. Disbarment terminates the lawyer’s status entirely, and in most jurisdictions a disbarred lawyer must wait at least five years before even applying for readmission.
Ineffective Assistance of Counsel
In criminal cases, a lawyer’s failure can have constitutional dimensions. Under the standard set by the Supreme Court in Strickland v. Washington, a defendant claiming ineffective assistance of counsel must prove two things: that the lawyer’s performance fell below an objective standard of reasonableness, and that there is a reasonable probability the outcome would have been different but for those errors.15Legal Information Institute (LII). Ineffective Assistance of Counsel Both elements must be satisfied. Courts review the lawyer’s performance with significant deference, so the bar is deliberately high. When a defendant clears it, the usual remedy is a new trial with competent representation.
Legal Malpractice
Separate from disciplinary proceedings, a client can sue a former lawyer for malpractice. A malpractice claim requires proving that the attorney-client relationship existed, the attorney’s conduct fell below the standard of care, that failure caused harm, and the client suffered actual financial damages.16Legal Information Institute (LII). Legal Malpractice In criminal defense cases, malpractice claims carry an extra layer of difficulty: the client typically must show they would have obtained a better outcome had the lawyer performed competently, which usually means proving innocence or a more favorable resolution as part of the malpractice case itself.