What Is Informal Discovery and How Does It Work?

Informal discovery is the voluntary exchange of facts, documents, and information between parties to a legal dispute outside the court-regulated procedures that govern formal discovery. Attorneys use it to interview witnesses, pull public records, swap documents, and talk directly with opposing counsel, often before a complaint is ever filed. It is faster and cheaper than formal discovery, but it has no teeth: if the other side declines to participate, nothing compels them. That single trade-off shapes almost every decision about when to use it.

How It Differs From Formal Discovery

Formal discovery runs on rules. In federal court, the Federal Rules of Civil Procedure dictate how parties exchange information through interrogatories, depositions, requests to produce documents, and requests for admission.¹ State courts have their own versions, but the structure is similar: the court supervises, deadlines are enforceable, and ignoring a discovery order has real consequences.

Those consequences bite. Under Rule 37, a court can treat disputed facts as proven against an uncooperative party, bar them from offering certain evidence, strike their pleadings, enter default judgment, or hold them in contempt. The court can also order the non-compliant party and their attorney to pay the other side’s expenses and fees.²

Informal discovery has none of that. No court supervises the exchange, no rules dictate the format, and no judge will sanction someone for declining an informal request. The process depends entirely on cooperation and professional courtesy between lawyers. The American Bar Association has observed that formal discovery exists in part because some information simply will not be volunteered.³

Common Methods Attorneys Use

The toolkit is broad. The right approach depends on the type of case, what you need to find, and how willing the other side is to engage.

Witness interviews conducted outside the formality of a deposition. People talk more freely when they aren’t under oath, but the statements carry less evidentiary weight than sworn testimony.
Voluntary document exchange between counsel, without a formal request for production. This works when both sides want to resolve things quickly.
Public records searches: court filings, property records, business registrations, regulatory filings, and government databases. Attorneys pull these to build a factual base before asking the other side for anything.
Site inspections of locations relevant to the case, such as an accident scene or a job site, to observe conditions and take photographs or measurements.
Expert consultations to test whether the facts support a theory before formally retaining or disclosing the expert.
Direct attorney-to-attorney requests. A phone call or email to opposing counsel resolves more questions than people expect.

Social Media and Online Research

Reviewing publicly available social media, websites, and online activity has become one of the most common informal techniques. An attorney can view public posts, photos, and check-ins without permission, and that content is often revealing. In personal injury cases, a plaintiff’s public activity sometimes contradicts their claimed limitations.

The ethical line is clear. Passive review of public content is fine. Deception is not. An attorney cannot send a friend request under a false name, use a third party to reach private content, or otherwise trick someone into sharing restricted information. Attorneys also need to verify the authenticity, date, and context of any social media content before relying on it.

When Informal Discovery Pays Off

The biggest returns come early, often before anyone files a complaint. During the pre-litigation phase, the parties have not hardened into adversarial postures, and information flows more freely. Witnesses are more willing to talk. Documents are easier to locate.

Several practical benefits follow from working this window:

Case evaluation. Informal investigation lets an attorney assess whether a case is worth pursuing, where the strongest claims lie, and where the weaknesses are.
Early settlement. When both sides have a clear picture of the facts, settlement talks become realistic. The ABA has observed that information gathered informally can be directly useful in settlement negotiations, and many cases resolve before formal discovery ever begins.³
Evidence preservation. Electronic data is fragile. Email systems, messaging platforms, and cloud storage services often auto-delete content on set schedules. Identifying key evidence early makes it less likely to disappear.
Narrowing formal discovery later. Informal work lets you draft more targeted interrogatories, more focused document requests, and more productive deposition outlines when the case does move into formal procedures.

Ethical Rules That Still Apply

Informal does not mean unregulated. Several professional conduct rules constrain how attorneys gather information outside formal channels, and violating them can lead to discipline, evidence suppression, or both.

Represented Parties

Under ABA Model Rule 4.2, an attorney cannot communicate directly with someone they know is represented by another lawyer about the subject of the matter, unless the other lawyer consents or a court authorizes the contact.⁴ To interview a witness who has their own attorney in the matter, you go through that attorney first.

Unrepresented People

When someone has no lawyer, Rule 4.3 applies. The attorney must identify who they represent and, where necessary, explain that their client’s interests may conflict with the unrepresented person’s interests. The attorney cannot give legal advice to that person beyond a suggestion to get their own counsel.⁵ The rules exist because an unrepresented witness may wrongly assume the attorney is neutral.

Honesty

Attorneys cannot misrepresent who they are or why they are asking questions, whether in person, by phone, or online. The same rule governs social media investigation. Passive review of public content is acceptable; fake profiles, deceptive friend requests, and intermediaries used to defeat privacy settings are not.

The Limits

Informal discovery works beautifully when both sides cooperate. When they don’t, you hit a wall with no tools to break through it.

No compulsion. You cannot force anyone to answer questions, hand over documents, or let you inspect property through informal channels. If they refuse, your only recourse is formal discovery after litigation begins.
No sanctions for refusal. Because informal discovery runs outside court rules, there is no mechanism to punish non-cooperation.²
Evidentiary limits. Information gathered informally often cannot go directly to the jury without additional steps to authenticate it or convert it into admissible form. An unsworn witness interview carries far less weight than a deposition transcript.
Reliability concerns. Without the oath requirement and other formal safeguards, there is greater risk that information you receive is incomplete, misleading, or self-serving.
No built-in privilege protection. Formal discovery includes procedures for resolving disputes over privileged material. Informal exchanges lack those guardrails, so privileged information can be inadvertently disclosed with no procedural framework to address the slip.

Experienced attorneys treat informal discovery as a complement to formal procedures, not a replacement. You use it to lay groundwork, identify what matters, and build working relationships with opposing counsel. When cooperation fails or critical evidence is being withheld, you switch to the tools that come with judicial enforcement.

Using Informally Gathered Material in Court

Finding information is one thing. Getting it in front of a jury is another. Courts don’t care how you obtained a document or learned a fact, but you still have to meet foundational standards before anything reaches evidence.

Authenticating Documents

Any document offered as evidence must be authenticated. Under Federal Rule of Evidence 901, that can be done through testimony from someone with knowledge, expert comparison, distinctive characteristics of the document itself, or other methods.⁶ The standard is the same whether the document arrived through a formal request for production or a voluntary email from opposing counsel. But documents produced in formal discovery often come with built-in authentication through the responding party’s verification, while informally exchanged documents may require you to call a witness to lay the foundation.

Unsworn Statements

Statements gathered during informal interviews are not sworn testimony, which limits their direct use at trial. Federal law allows unsworn written declarations to substitute for sworn statements in many contexts, however, if the person signs the document and includes specific language declaring the contents true under penalty of perjury.⁷ For declarations signed within the United States, the required language is: “I declare (or certify, verify, or state) under penalty of perjury that the foregoing is true and correct.”

Even without that declaration language, informal statements have real uses. They can impeach a witness who changes their story at trial, refresh memory on the stand, or guide the drafting of formal discovery. Attorneys who conduct informal interviews often follow up by locking in the testimony through formal discovery.

Work Product Protection

Notes, memoranda, and other materials your attorney creates during informal investigation are generally protected from disclosure under the work product doctrine. Rule 26(b)(3) provides that documents and tangible things prepared in anticipation of litigation by a party or their representative, including attorneys, consultants, and investigators, are ordinarily not discoverable by the opposing side.¹ An opposing party can overcome that protection only by showing substantial need and inability to obtain equivalent information without undue hardship. Even then, the court must protect the attorney’s mental impressions, conclusions, and legal theories.

The key requirement is that the materials were created because of anticipated litigation, not as part of routine business operations.

Preserving Evidence While Investigating Informally

One obligation applies regardless of whether discovery is formal or informal: the duty to preserve relevant evidence once litigation is reasonably anticipated. That duty arises before any lawsuit is filed and applies to both sides. A party who destroys or fails to preserve relevant evidence, intentionally or through negligence, risks serious sanctions.

Under Rule 37(e), when electronically stored information that should have been preserved is lost because a party failed to take reasonable steps, the court can order measures to cure the resulting prejudice. If the court finds the loss was intentional, consequences escalate: the court can instruct the jury to presume the lost evidence was unfavorable, or dismiss the case or enter default judgment.²

This matters most during informal discovery because the pre-litigation period is when evidence is most vulnerable. Email systems auto-delete messages, cloud platforms archive old files, and employees overwrite data as part of normal operations. A preservation letter to the other side or an internal litigation hold protects the evidence you will need later, whether or not the current investigation is formal.

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
2
Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions
3
American Bar Association. Updated Standards for the Provision of Civil Legal Aid – Guideline B-9.4 on Discovery
4
American Bar Association. Rule 4.2 – Communication With Person Represented by Counsel
5
American Bar Association. Rule 4.3 – Dealing With Unrepresented Person – Comment
6
Legal Information Institute. Federal Rules of Evidence Rule 901 – Authenticating or Identifying Evidence
7
Office of the Law Revision Counsel. 28 U.S. Code 1746 – Unsworn Declarations Under Penalty of Perjury