Missouri: Call and Conversation Recording Consent Requirements

Requirements one by one

Governing law and covered recording

Missouri's Wiretap Act is RSMo §§ 542.400 through 542.422. Under § 542.400(6), interception means acquiring a wire communication's contents through an electronic or mechanical device. Section 542.402.1 creates a class E felony for knowingly intercepting a wire communication. It separately reaches an oral communication only when the device "transmits communications by radio or interferes with the transmission" (§ 542.402.1(2)). That wording makes the in-person analysis depend on both the speaker's privacy expectation and the device, not consent alone.

Whose consent a participant needs

For a private person's wire interception, § 542.402.2(3) states the rule directly:

It is not unlawful ... where such person is a party to the communication or where one of the parties to the communication has given prior consent to such interception.

So a participant may record a covered wire call without another participant's permission. An outsider needs one party's prior consent. The exception disappears if the interception is for a criminal or tortious act.

The private-person exception says "wire communication," not "oral communication." For face-to-face speech, use the narrower offense text in § 542.402.1(2) instead of carrying the phone-call rule over automatically.

Privacy, confidentiality, or secrecy trigger

Section 542.400(8) defines an oral communication as speech by someone who exhibits an expectation against interception under circumstances that justify the expectation (§ 542.400). That is a factual privacy test. The statute's official case note illustrates the boundary: people speaking in a public jail could not justifiably expect privacy.

The wire definition has no parallel privacy phrase. Once the communication fits § 542.400(12)'s common-carrier wire/cable definition, § 542.402's wire rule supplies the consent analysis.

Telephone, in-person, and electronic coverage

A wire communication is one carried at least partly through common-carrier wire, cable, or a similar connection (§ 542.400(12)). The official case note recognizes a cellular-to-landline conversation as a wire communication. The Act does not contain a separate "electronic communication" category, so do not assume that every app, stored message, or all-wireless path has the same state-law classification without checking how the communication traveled.

Face-to-face speech can be an oral communication if the privacy test is met. But the criminal provision reaches that oral communication only when the recording device transmits by radio or interferes with the transmission (§ 542.402.1(2)).

How consent or notice is given

Being a party is independently enough for a private wire recording. If the recorder is not a party, § 542.402.2(3) requires one party's prior consent. The statute does not prescribe a written release, announcement, beep tone, or particular words.

Major participant-facing exceptions

The criminal-or-tortious-purpose limit is the main participant-facing boundary. A private person's otherwise permitted wire interception loses the § 542.402.2(3) protection when made for such a purpose.

The Act also lets a common carrier intercept, disclose, or use a wire communication in the normal course when necessary to provide service or protect its rights or property. Random monitoring remains barred except for mechanical or service-quality checks (§ 542.402.2(1)).

Criminal classification and penalty

Section 542.402.1 classifies a violation as a class E felony. The general sentencing statute authorizes up to four years' imprisonment (§ 558.011.1(5)). For an individual, the ordinary felony fine ceiling is $10,000; if the offense produced money or property, the court may instead impose up to twice the gain (§ 558.002.1).

Civil remedy and evidence effect

Section 542.418 gives a person whose wire communication was unlawfully intercepted, disclosed, or used a civil action. Damages are actual damages with a floor of the greater of $100 per day or $10,000, plus punitive damages for a willful or intentional violation and reasonable attorney's fees and costs. Good-faith reliance on a court order or § 542.408 is a prima facie defense (§ 542.418).

Section 542.420 excludes unlawfully obtained wire contents and derivative evidence from trials, hearings, and other proceedings (§ 542.420). Both that evidence rule and § 542.418's civil action say "wire communication"; neither expressly extends these remedies to an oral communication.

Interstate and federal boundary

Federal law permits a private participant—or an outsider with one party's prior consent—to intercept a wire, oral, or electronic communication unless the purpose is criminal or tortious (18 U.S.C. § 2511(2)(d)). Missouri's private wire rule is similar, but its definitions and in-person device trigger can make the state-law analysis different.

This page does not decide which jurisdiction governs an interstate call. When another participant or the recording device is in a stricter state, obtaining everyone's consent is the prudent baseline.

What trips people up

Missouri is not one simple one-party rule for every microphone. The private participant exception in § 542.402.2(3) is written for a wire communication. The in-person offense is separately limited to a protected oral communication captured with a device that transmits by radio or interferes with transmission. The medium and device therefore matter before consent is even analyzed.

The statutory remedies are wire-specific too. Sections 542.418 and 542.420 expressly address wire communications. Do not automatically attach their $10,000 damages floor or evidence bar to every disputed in-person recording.

Common questions

Can I record a Missouri telephone call I am participating in?

Yes, if it is a wire communication within § 542.400. Section 542.402.2(3) makes the recording lawful because you are a party, unless your purpose is to commit a criminal or tortious act.

Does Missouri require a recording announcement or beep?

Not in this statute. For a private wire recording, party status is enough; an outsider instead needs one party's prior consent. The Act does not prescribe how that consent must be documented.

Does the civil damages statute cover a secretly recorded room conversation?

Section 542.418 expressly creates its claim for a "wire communication." Other claims may depend on different law, but the Wiretap Act's listed $100-per-day-or-$10,000 remedy is not written for oral communications.

Statutes and sources

• Mo. Rev. Stat. § 542.400 — wire, oral, and interception definitions. https://revisor.mo.gov/main/OneSection.aspx?section=542.400 (accessed 2026-07-20)
• Mo. Rev. Stat. § 542.402 — wire and oral offenses, private one-party wire exception, carrier exception, and class E felony classification. https://revisor.mo.gov/main/OneSection.aspx?section=542.402 (accessed 2026-07-20)
• Mo. Rev. Stat. §§ 542.418 and 542.420 — wire-specific civil damages and evidence consequences. https://revisor.mo.gov/main/OneSection.aspx?section=542.418 (accessed 2026-07-20)
• Mo. Rev. Stat. §§ 558.011 and 558.002 — class E imprisonment and felony fine ceilings. https://revisor.mo.gov/main/OneSection.aspx?section=558.011 (accessed 2026-07-20)
• 18 U.S.C. § 2511(2)(d) — federal private-participant consent rule. https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title18-section2511&num=0&edition=prelim (accessed 2026-07-20)