Who counts as a prospective client under Rule 1.18
The language of Model Rule 1.18 is clear: anyone who consults with a lawyer about the possibility of forming a client-lawyer relationship becomes a "prospective client." This status does not depend on whether the person ultimately retains you. It does not require a signed engagement letter, payment, or even a promise to hire. A single substantive conversation can be enough.
What counts as a consultation? The rule is broader than many lawyers realize. Even a short call, an email exchange, or a brief office meeting where legal advice is sought can trigger the duties. The prospective client must provide information with the intent to employ the lawyer's services. Casual conversations, marketing events, or "meet and greet" chats rarely qualify, but the minute legal advice or strategy is discussed, risk begins.
Some states and ethics opinions emphasize the prospective client's reasonable belief that a consultation is occurring. If you give off the impression that you are listening in your professional capacity, it may be hard to claim later that the person was not a prospective client.
Keep reading: Consentable vs Nonconsentable Conflicts Under Rule 1.7(b)
What confidentiality you owe someone who never signed
Prospective clients, under Rule 1.18(b), receive a special kind of confidentiality. You cannot use or reveal information learned from them, even if they do not become your client. This is not as broad as the duties owed to a current or former client under Rules 1.6 and 1.9, but the protection is real and enforceable.
The duty covers information the lawyer receives in the consultation. If a prospective client shares a sensitive detail about a business dispute, a divorce, or a criminal charge, that knowledge cannot be turned around and used in another case against them. This is true even if the information was never written down.
Exceptions are limited. Rule 1.18(b) does not prevent a lawyer from using information that becomes generally known, or that is not "significantly harmful" to the prospective client. But these exceptions are narrow, and courts interpret them cautiously.
When information received becomes disqualifying
Rule 1.18(c) sets out a major risk: if the information received from a prospective client could be "significantly harmful" to them in a later matter, the lawyer is disqualified from representing a client adverse to the prospective client in that matter. This applies even though the person never hired you.
What counts as "significantly harmful"? The rule does not define the term, but ethics opinions and court decisions provide guidance. Information that goes to the heart of the opposing party's case, facts about financial position, litigation strategy, or negotiation bottom lines, is typically considered harmful. Even a small detail, if it gives an edge in the later matter, may be enough.
Disqualification can extend to every lawyer in your firm. If you practice with another lawyer, even in a two-person office, both may be barred from the representation if either of you received disqualifying information during the intake.
Examples of disqualifying and non-disqualifying information
- Disqualifying: A potential client in a divorce reveals hidden bank accounts or intentions not to disclose assets, then hires another lawyer. You may be unable to represent their spouse.
- Non-disqualifying: Someone calls to ask if you handle employment law and gives no details about their case. If no confidential information is shared, you likely avoid obligations.
Keep reading: Eight Conflict Check Mistakes That Get Solo Firms Disqualified
Limiting language that keeps a consultation narrow
You can reduce the risk of disqualification by controlling what information you receive at the outset. Many attorneys use intake scripts or written disclaimers that direct prospective clients not to provide confidential or detailed facts until a conflict check has cleared. This language, when used consistently, can protect against receiving information that later disqualifies the firm.
A simple statement helps: "Please do not share details about your case until I confirm that I do not have a conflict of interest." Posting this on a website contact form, stating it at the start of a phone call, or including it in an email auto-reply can make the difference. If a prospective client ignores these instructions and volunteers information anyway, some courts will find that the lawyer's duty is reduced or eliminated.
Of course, limiting language must be clear, timely, and documented. A vague disclaimer buried in a website footer or thrown in late may not suffice. Courts will look at how the lawyer actually conducted the intake.
Written consent, screening, and notice as the way back
Once a lawyer is disqualified under Rule 1.18, all is not necessarily lost. Rule 1.18(d) provides a way for the firm to proceed with representation, but only under specific conditions:
- Both the affected client and the prospective client must give informed written consent.
- Alternatively, if the lawyer took steps to limit exposure to disqualifying information, and another lawyer in the firm is screened from any participation, the firm may proceed with representation. The screening must be timely and effective.
- Written notice must be given to the prospective client, outlining the screening procedures and the firm's compliance.
This is not just a formality. The screening must be real and documented. The lawyer who received information must be walled off, no discussion of the matter, no access to files, and no share in any fee. The notice to the prospective client must be prompt.
Smaller firms may find strict screening requirements difficult to implement, especially where attorneys share support staff or physical space. In those cases, consent from both sides is the safest course, but that is not always practical or likely to be granted.
See how ConflictCheck handles this for legal services
How state versions of 1.18 depart from the Model Rule
Most states have adopted a version of Rule 1.18, but variations exist. Some states add extra steps, while others limit protections or use different standards for disqualification and screening.
A few states require that the prospective client's information be "material" to the matter before disqualification is triggered. Others, like California, use the "duty of loyalty" standard from its own rules, which can be broader or narrower depending on the facts. In some states, screening is permitted only in larger firms, or must meet stricter procedural requirements.
The duty to prospective clients may also differ for government lawyers, legal aid offices, or in contexts like mediation. A handful of states require additional disclosures or impose time limits on how long a prospective client's information remains disqualifying.
Lawyers must review their own state's version of Rule 1.18 and any relevant ethics opinions. Do not assume the Model Rule language applies without checking.
Documenting a consultation you declined
For solo and small firm attorneys, documentation is the main protection. A clear record of who contacted you, what information was shared, and how you handled the conversation is essential. This protects against later disputes about whether the person was a prospective client and what you learned.
Use a structured intake form that records the date, the identity of the caller, and any limiting language provided at the start of the conversation. Note whether the prospective client was warned not to share confidential details before a conflict check. Mark down whether any information was actually received, and if so, what it was.
If you decline representation, keep a dated screening record. Record when and how the decision was made, and if applicable, how any screening or notice requirements were met. Retain these records along with your other conflict check materials.
Paper files work, but digital tools can make this process faster and more reliable. Many firms now use software that automates intake, flags adverse parties, and creates a time-stamped record of the screening process. A structured intake form with automatic adverse party search and a dated screening record can help ensure compliance with Rule 1.18, reducing risk for the solo or two-lawyer firm.
