Rule 36 Reasonable Inquiry: Can You Say “I Don’t Know”?

Legal content overseen by Nathan Walter, Esq., attorney licensed in California (State Bar No. 313299).

A federal request for admission (RFA) cannot be answered with a bare “I don’t know.” Rule 36 reasonable inquiry requires the party to state that it made reasonable inquiry and that known or readily obtainable information remains insufficient. The response must detail why it cannot truthfully admit or deny (Fed. R. Civ. P. 36(a)(4)).

If a former employee’s receipt of a notice is uncertain, what should a defense team check?

Below are an inquiry checklist, three response examples, and the distinct consequences of late answers, deficient answers and nonadmission. For context, see our request-for-admission overview and discovery response workflow.

What does Rule 36 reasonable inquiry require?

Federal Rule 36(a)(4) allows a lack-of-information response only if the responding party states that it has made reasonable inquiry and that the information it knows or can readily obtain is insufficient to admit or deny (Fed. R. Civ. P. 36(a)(4)). The same subsection requires a detailed explanation of why a truthful admission or denial cannot be given. The 1970 Advisory Committee Note says the rule requires only that the answering party make reasonable inquiry and secure the knowledge and information readily obtainable by the party, and it does not prescribe a fixed checklist.

Use this federal quick reference to distinguish the response choices and consequences:

What counts as an inquiry rather than a disclaimer?

An inquiry is something the party actually did before it signed the response. Rule 36(a)(4) conditions the lack-of-knowledge answer on the party stating that it made reasonable inquiry, and that statement is a representation about what happened. A stock sentence added to every response, when no one looked, does not reflect an inquiry made.

How is an inability to answer different from a denial?

A denial contests the matter. An inability to answer reports that, after reasonable inquiry, the party’s known or readily obtainable information is insufficient to admit or deny.

Rule 36(a)(4)’s detailed-explanation requirement applies to an inability to admit or deny; it does not require every denial to carry an evidentiary narrative. A denial must still fairly respond to the substance of the matter (Fed. R. Civ. P. 36(a)(4)).

If my client does not remember, what information should we check?

A client’s lack of memory is not, by itself, the complete federal standard: Rule 36(a)(4) also concerns information the responding party knows or can readily obtain (Fed. R. Civ. P. 36(a)(4)). As a practical workflow, the team can identify the precise proposition, ask who has relevant information, and review readily obtainable records before choosing a response. Those steps are examples of an inquiry process, not a court-prescribed minimum for every case.

1. Identify the proposition and the relevant period

Separate the pieces of the request. Sending a notice, the date it was sent, who received it, when it was received, and what followed are different propositions, and the answer may differ for each.

Rule 36(a)(2) requires the requesting party to state each matter separately. The answering party must still fairly address the substance and, when good faith requires, specify the part admitted and qualify or deny the rest (Fed. R. Civ. P. 36(a)(2), (4)).

2. Match the proposition to people and records

In the employment example, the sources might include the notice copy, relevant email, a delivery record, the HR custodian and the person alleged to have received it. The right sources depend on the request. Rule 36(a)(4) does not say that every custodian, former employee, third party or archive must always be contacted or searched. Its focus is information the party knows or can readily obtain. Our guide to organizing discovery documents can help when the records are scattered.

3. Record what remains unknown

Keep an internal worksheet with these fields:

• Request number.
• The proposition being tested.
• Sources actually checked.
• Person consulted.
• What was learned.
• What remains unknown.
• Draft disposition (admit, qualify, deny or unable to answer).
• Attorney reviewer.

The worksheet is a suggested internal working aid; Rule 36(a)(4) does not prescribe this form or require it as an attachment to the answer. Calling a document internal does not itself make it privileged or protected from discovery. The attorney should assess any privilege or work-product claim under the applicable rules, including Rule 26(b)(3) and (5), and approve the response.

How do I write an insufficient-information or partial response?

If information remains insufficient after reasonable inquiry, Rule 36(a)(4) requires the party to state that inquiry was made and explain in detail why it cannot truthfully admit or deny (Fed. R. Civ. P. 36(a)(4)). If only part of the requested matter can be admitted and good faith requires qualification, the answer must specify the admitted part and qualify or deny the rest. Neither a blanket denial nor an unexplained “insufficient information” response substitutes for that rule language.

The following examples are invented and illustrate wording, not ready-to-serve responses. They fit into a broader discovery drafting process.

When the entire matter is known

Request: Admit that Defendant sent the identified notice on June 4.

Assumed facts: Contemporaneous records and the relevant employee confirm that exact event.

When the request is only partly true

Request: Admit that Defendant sent the identified notice on June 4 and that the employee received it that day.

Assumed facts: Sending is established. Receipt is established as June 5.

This follows Rule 36(a)(4): specify the part admitted, then qualify or deny the rest (Fed. R. Civ. P. 36(a)(4)).

When inquiry still leaves the matter unknown

Request: Admit that a specified former employee personally opened a specified email on June 4.

Assumed facts: The team checked the available email and delivery records and consulted people with relevant information. The results do not establish whether the former employee opened the email.

This example assumes the listed steps were actually completed. It is not a script to use without doing the work, and it does not require disclosing privileged advice.

Can I object to an RFA just because the fact is disputed?

No. Federal Rule 36(a)(5) prohibits an objection based solely on the ground that the request presents a genuine issue for trial (Fed. R. Civ. P. 36(a)(5)). A party that objects must state its grounds, while a party answering must use the response that Rule 36(a)(4) and the facts support.

Requests may address facts, the application of law to fact, opinions about either, and the genuineness of described documents, within the scope of Rule 26(b)(1) (Fed. R. Civ. P. 36(a)(1)). That scope is any nonprivileged matter relevant to a party’s claim or defense and proportional to the needs of the case.

What is the difference between an objection and a denial?

An objection states grounds for not answering the request as posed. A denial answers the substance and says the matter is not admitted. Rule 36(a)(5) bars an objection based solely on a genuine issue for trial; it does not eliminate other valid objection grounds. If answering rather than objecting, the party must use the admission, denial, qualification or detailed inability-to-answer response supported by Rule 36(a)(4).

Our discovery objections cheat sheet offers general background on objections.

What happens if my Rule 36 response is late or evasive?

Under Federal Rule 36(a)(3), a matter is admitted unless the responding party timely serves a written answer or objection signed by the party or its attorney; the default period is 30 days after service, subject to authorized changes and applicable time-computation rules (Fed. R. Civ. P. 36(a)(3)). A challenged answer presents a different issue: Rule 36(a)(6) permits a sufficiency motion, and a noncompliant answer can lead to an order admitting the matter or requiring an amended answer. These are not interchangeable consequences.

What is the response deadline?

The default period is 30 days after service, and a shorter or longer time may be stipulated under Rule 29 or ordered by the court (Fed. R. Civ. P. 36(a)(3)). Days are counted under Rule 6(a)(1), which excludes the trigger day, counts weekends and holidays, and carries a last day that falls on a weekend or legal holiday to the next day that is not one.

When a party must act within a specified time after service made under Rule 5(b)(2)(C), (D) or (F), Rule 6(d) adds 3 days after the period would otherwise expire under Rule 6(a), not immediately after service. Rule 6(d) identifies those methods as mail, leaving with the clerk, and other means consented to; it does not include service under Rule 5(b)(2)(E) (Fed. R. Civ. P. 6(d)).

What can the court do with an insufficient answer?

The requesting party may move to determine the sufficiency of an answer or objection. Unless the court finds an objection justified, it must order that an answer be served. On finding that an answer does not comply with the rule, the court may order either that the matter is admitted or that an amended answer be served (Fed. R. Civ. P. 36(a)(6)).

Rule 36(a)(6) applies Rule 37(a)(5) to an award of expenses on that motion.

Does a late answer automatically withdraw an admission?

No. A matter admitted under Rule 36 is conclusively established unless the court, on motion, permits the admission to be withdrawn or amended (Fed. R. Civ. P. 36(b)). Subject to Rule 16(e), the court may permit it if doing so would promote the presentation of the merits and the court is not persuaded it would prejudice the requesting party in maintaining or defending the action on the merits.

Can a failure to admit lead to attorney’s fees later?

Yes. Federal Rule 37(c)(2) allows a requesting party that later proves a document genuine or a matter true to move for the reasonable expenses, including attorney’s fees, incurred in making that proof (Fed. R. Civ. P. 37(c)(2)). The court must so order unless one of the rule’s four exceptions applies. This proof-expense mechanism differs from automatic admission for no timely response and from a motion testing whether an answer is sufficient.

The four exceptions are:

• The request was held objectionable under Rule 36(a) (37(c)(2)(A)).
• The admission sought was of no substantial importance (37(c)(2)(B)).
• The party failing to admit had a reasonable ground to believe it might prevail on the matter (37(c)(2)(C)).
• There was other good reason for the failure to admit (37(c)(2)(D)).

The 1970 Advisory Committee Note links a failure to inform oneself before answering to Rule 37(c)’s cost mechanism (Fed. R. Civ. P. 36, advisory committee note, 1970). Its historical reference to costs after trial does not limit current Rule 37(c)(2), which says the requesting party must later prove the matter, without restricting that proof to trial.

Do state-court requests for admission follow this federal rule?

This guide explains the Federal Rules of Civil Procedure, not a state-court response standard. Rule 36(a)(4) is the source of the reasonable-inquiry language discussed here, so this federal answer should not be read as a statement of any particular state’s rules.

Identify the governing jurisdiction before reusing any example. Our request-for-admission overview gives general background.

How can Briefpoint help draft RFA responses for attorney review?

Briefpoint drafts responses and objections to requests for admission and produces output editable in Microsoft Word, with attorneys keeping final review. Client Bridge sends clients plain-language questions through a secure link so they can answer and upload documents for attorney review. Those functions can support the team’s work, but an attorney must assess whether the actual inquiry and response satisfy Rule 36(a)(4).

For defense firms, client answers and uploaded documents can come back through Client Bridge before the attorney decides whether to admit, qualify, deny or state that the information is insufficient. Read how AI discovery responses work, or see the discovery response drafting product page.

Book a demo to see how Briefpoint supports discovery response drafting.

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FAQs about Rule 36 reasonable inquiry: What else should you know?

In federal practice, Rule 36(a)(4) distinguishes a substantive denial from an inability to answer after reasonable inquiry. A bare lack-of-knowledge statement, a qualified admission and an objection raise different requirements under Rule 36(a)(4)–(5). The answers below keep those distinctions separate from the timing and expense provisions.

Can I answer a federal request for admission with “insufficient information”?

No. Treat the response as an explanation of an unresolved matter, not a label. Under Federal Rule 36(a)(4), it must state that reasonable inquiry was made, state that known or readily obtainable information remains insufficient, and detail why a truthful admission or denial is impossible. The statement that inquiry was made must be true.

Is asking my client enough to satisfy Rule 36 reasonable inquiry?

Rule 36(a)(4) does not establish a universal client-interview safe harbor. The standard includes information the responding party knows or can readily obtain, not just the client’s immediate recollection. Depending on the proposition, readily obtainable records and people with relevant information may help resolve the answer. The rule does not prescribe a fixed number of interviews or searches.

Can I admit part of a request and deny the rest?

Yes. Read each proposition before choosing one response for the whole request. If good faith requires a qualified answer or partial denial, Federal Rule 36(a)(4) calls for identifying what is admitted and qualifying or denying the remainder. A fact you can admit should not disappear inside a blanket denial of a partly incorrect request.

Does an evasive RFA answer automatically become an admission?

No. A challenged answer is addressed through Federal Rule 36(a)(6)’s sufficiency procedure. If the court finds the answer noncompliant, it may order the matter admitted or require an amended answer. That differs from Rule 36(a)(3), under which a matter is admitted when no written answer or objection is timely served, so the two procedures are not interchangeable.

Can a reasonable denial still lead to proof expenses?

Later proof alone does not eliminate Rule 37(c)(2)’s exceptions. The court must not order proof expenses under that provision if the nonadmitting party had a reasonable ground to believe it might prevail. The other exceptions are a request held objectionable under Rule 36(a), an admission sought of no substantial importance, or other good reason for failing to admit. The requesting party must move for the expenses.

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