Disputed audio evidence: what to do before court

A tenant in a dispute with a landlord produces a recording. On it, the landlord seems to agree to waive three months of rent. The landlord says the conversation never happened and the voice is not his. The recording is a file on a phone, with no clear history.

This scene is a composite example, not a real case.

Cases like this used to turn on whom the judge believed. Now there is a new line available to anyone: "that could be AI." Sometimes it is true. Sometimes it is a tactic. Both sides need to be ready for it.

Two problems, not one

• A fake recording presented as real. Cloned audio used to support a claim.
• A real recording called fake. Researchers call this the liar's dividend: once fakes are common, genuine evidence gets easier to deny.

Plan for both. The first protects you from being misled. The second protects a genuine recording from a lazy challenge.

Preserve first, analyze second

Most damage to audio evidence happens before anyone listens carefully. These steps cost nothing.

• Keep the original file. Not a forward, not a screen recording, not an export from a chat app if the original still exists.
• Do not edit, trim or "clean it up". Even a harmless trim produces a different file.
• Write down its history. Who made the recording, on which device, when, and who has held the file since.
• Make copies and work on the copies. Store the original untouched and note every copy you create.
• Keep what surrounds it. File name, date, device, app, the messages around it. Context can matter as much as the sound.

How to check a recording that is under challenge

Begin with the story around the file, before the sound. Who recorded it, on what, and when? Does the date match the phone's records, the messages before and after, the calendar? Does anyone else remember the conversation? A recording whose history holds together is hard to dismiss. One with gaps deserves a closer look, whichever side produced it.

Whatever analysis follows, state its limits to anyone who reads it.

• No analysis is a verdict. It does not decide admissibility and it does not decide who is telling the truth.
• A question about the file is not a question about the person. Who is speaking is a separate issue.
• "Inconclusive" is a legitimate answer. Some recordings do not carry enough to judge, and an honest report says so.

The weight of any such result is for the judge, the experts and the rules of the jurisdiction. Use it to decide your next step. Don't present it as more than that. We cover how to read a report in what a voice recording report can and cannot prove.

When you need an expert

If a recording is central to the case, or the sums are large, a qualified forensic audio expert who can testify is the right route. A structured first report helps you triage: is this file worth the cost of a full expert opinion? It does not replace that opinion.

A short checklist for lawyers

1. Ask the client for the original file at first contact, and tell them not to forward or edit it.
2. Ask how the recording was made, and whether the other party knew.
3. Check the local rules on recording consent before relying on it.
4. If the other side raises "AI", ask what they base it on. A claim without a basis is not evidence.
5. Decide early whether an expert is needed, and budget for it.

FAQ

Can a voice recording still be used as evidence if AI fakes exist?

Yes, but expect it to be challenged more often. Keeping the original file and a written record of who held it makes a genuine recording easier to defend.

Will an analysis of the recording settle the dispute?

No. It can inform the next step, it may be inconclusive, and it does not identify who is speaking. Courts decide weight and admissibility under their own rules.

What should I never do with a recording I might need?

Do not edit, trim or re-save it, and do not rely on a forwarded copy. Keep the original untouched and work on copies.