Custody documentation guide

Can I record my co-parent in Missouri?

for a participant

For your own calls, generally yes.

RSMo 542.402.2(3) lets a party record a wire communication unless it is intercepted "for the purpose of committing any criminal or tortious act". Unlawful interception is a class E felony. RSMo 542.418 then addresses when wire communications can be used in civil cases.

Main statute: RSMo § 542.402
Main caution: Class E felony; $10,000 civil minimum

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Missouri is a one-party consent state. Two Missouri details are worth knowing. The state wiretap law is written mostly around phone calls. It also contains a civil-evidence rule that sounds broader than courts have applied it. Both are easy to misread.

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Your own calls

If you are on the call, Missouri generally lets you record it. The other parent does not have to agree, and you do not have to warn them.

The exemption has a condition. It ends if the recording is made to commit a criminal or tortious act. A tortious act is a civil wrong, such as invasion of privacy.

The wording of the exemption

Missouri makes interception a class E felony, then lists what is not unlawful.

For a person not acting under law to intercept a wire communication 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 unless such communication is intercepted for the purpose of committing any criminal or tortious act (RSMo 542.402).

Keep your purpose simple. Record to remember accurately, not to threaten or shame.

The state law is mostly about calls

Missouri's private-party exemption is written around wire communications, which generally means phone calls. For in-person talk, the state offense is narrower and covers devices that transmit by radio or interfere with a transmission.

That is not permission to hide a recorder. Federal law may still govern an in-person recording: a participant may generally consent, while a nonparticipant cannot assume consent for a protected oral communication. A recorder left in a room you are not in has no party's consent.

The civil-evidence rule

RSMo 542.418.1 says the contents of "any wire communication" shall not be received in evidence in any civil or administrative proceeding. The exception is a claim brought under that section.

Read alone, that sounds like every recorded call is barred from a custody case. The Court of Appeals has read it more narrowly.

How Missouri courts have read it

In Phillips v. American Motorist Insurance Co. (1999), the Court of Appeals held the trial court was wrong to exclude a lawful one-party recording under this section. The court read Section 542.418 as limiting the use of information from an authorized law-enforcement wiretap in an unrelated civil case, not as excluding every lawful private recording.

That is useful but not a guarantee in a custody case. The recording still has to be lawful, relevant, authenticated and admitted under the court's rules. Ask your lawyer before relying on it.

The cost of crossing the line

Recording a call you are not part of, with no party's consent, is a class E felony. Using spyware on the other parent's phone falls in the same place.

The person recorded can also sue under RSMo 542.418. The minimum is $100 a day of violation or $10,000, whichever is greater. Punitive damages and legal fees can be added.

Your child's calls

A call between your child and the other parent is one you are not part of. The party exemption does not cover it.

Some courts let a parent consent for a young child under Pollock v. Pollock. That needs a genuine, reasonable belief that recording is necessary for the child's welfare. Missouri has not clearly settled this, so get advice first.

What to keep instead

A written note avoids every question on this page. Write it the same day, with the clock time, the words in quotation marks and who was there.

Keep schedule messages in a dated communication record. Keep calls and voicemails in a call log for custody records. Then take a few weeks of notes to a Missouri family lawyer.

A Missouri parenting-plan note without an evidence question

Missouri's rules on using recordings are complicated. A written note is simple. Make it the same day.

Time it to the minuteNote the date and clock time you are writing, and the date and clock time of the event itself.
Quote, don't summarisePut the words you actually heard inside quotation marks. Mark anything you are paraphrasing as a paraphrase.
Name who else was thereList every adult and child present, and anyone within earshot who is not part of the family.
Separate what your child saidRecord a child's words as reported speech, and never question a child again to sharpen a quote.
Tie it to the parenting planName the part of the parenting plan the event touches, such as an exchange time or a holiday.
Point at the corroborationName the message, receipt, school note or third party that supports the entry, and say where it is kept.

Keep the Missouri record that is simple to use

Casewell keeps your dated entries, the words you heard and the files behind them in one private place. Writing on the day is what makes a record credible. Export a focused PDF of the months a Missouri lawyer asks for.

Is Missouri a one-party consent state?

Yes. RSMo 542.402.2(3) lets a party to a call record it, unless the recording is made for a criminal or tortious purpose.

Can a recorded phone call be used in a Missouri custody case?

RSMo 542.418.1 restricts wire communications in civil proceedings. In Phillips v. American Motorist Insurance Co., the Court of Appeals held it does not exclude lawful recordings. Ask your lawyer how it applies before any hearing.

Can I record an in-person conversation in Missouri?

If you are part of it, federal law generally permits one-party consent, subject to the facts and any other applicable law. A device left recording a room you are not in has no party's consent.

What is the penalty for illegal recording in Missouri?

Unlawful interception is a class E felony. The person recorded can also sue for at least $100 a day of violation or $10,000, whichever is greater.

Can I record my child's calls with their other parent in Missouri?

That is a conversation you are not part of. Vicarious consent is not clearly settled in Missouri, so take advice before relying on it.

Sources

This page quotes the Revised Statutes of Missouri, sections 542.402 and 542.418, from the Missouri Revisor of Statutes. It refers to the Court of Appeals decision in Phillips v. American Motorist Insurance Co. It is not legal advice.

RSMo 542.402 — unlawful interception, a class E felony, and the party exemption checked September 2026
RSMo 542.418 — wire communications in civil proceedings, and civil damages checked September 2026
Phillips v. American Motorist Insurance Co., 996 S.W.2d 584 (Mo. App. 1999) — section 542.418 and lawful recordings checked September 2026
18 U.S.C. 2511(2)(d) — the federal one-party consent floor and its criminal-or-tortious-purpose proviso checked September 2026
Pollock v. Pollock, 154 F.3d 601 (6th Cir. 1998) — the vicarious consent doctrine checked September 2026