Expert Witness Testimony and Affidavits for Text Message Evidence

When a court needs more than the exhibit itself, Hearsay can provide a signed affidavit describing how the messages were collected and, if the matter calls for it, a member of our team to testify. Both are built on the same record every Hearsay collection produces: encryption hashes of the data at extraction, a complete audit log, and chain-of-custody documentation.

Most text-message exhibits never need a witness from us. The client or attorney who ran the collection, together with the hashes and logs, usually supplies the foundation. This page explains what we provide when that is not enough.

What every collection already includes

Before any affidavit or testimony, every Hearsay collection generates the documentation a court looks for when it asks whether an exhibit is complete and unaltered:

• Encryption hashes of the data being collected, with real-time hash verification during extraction, so the exported file can be checked against what was on the device.
• Complete audit logs of all system actions during the collection, review and export.
• Detailed chain-of-custody documentation.
• Deletion reporting with every text message extraction.

These are included with the collection. Details: Data integrity and authenticity.

Signed affidavits

If opposing counsel or the court asks how the messages were collected, or a rule such as Federal Rule of Evidence 902(13)–(14) calls for a certification from a qualified person, we provide a signed affidavit or declaration from a Hearsay team member explaining our process and technology: what the extractor does, how hashes are generated and verified, how the audit log is kept, and how the export relates to the data on the device.

The affidavit speaks to Hearsay's process. It does not speak to who authored a message or what it means; those remain questions for the parties and their witnesses.

When to request one: as soon as you anticipate an authentication challenge, or when you plan to rely on a self-authentication rule (FRE 902(13)–(14) in federal court, or a state equivalent) and need the certification and notice in place before the hearing.

Expert testimony

When a matter requires live testimony about the collection, a member of our team can appear, in person or remotely as the court allows, to explain the extraction process, the integrity controls, and the documentation for the specific collection at issue.

Testimony is scoped to what Hearsay did and how the technology works. We are not retained to opine on the merits, on authorship, or on the meaning of the messages.

When to request it: when the authenticity or integrity of the extraction itself is contested, or when the court wants a witness who can be cross-examined on the process rather than a declaration.

Related services for contested collections

• In-person extraction. A Hearsay team member arrives with equipment and runs the collection on site, which some courts and opposing parties prefer for contested devices.
• Opposing-party collections. Hearsay coordinates and monitors extractions from an opposing party's device under an agreed protocol or court order, so both sides work from the same verified data.
• Custom outputs. Court documents in formats a particular court or expert requires.
• Managed service. Project management for larger or more complex matters.

Each is available on a per-matter basis; see Pricing for the current options.

How to request an affidavit or testimony

1. Open the collection in your Hearsay workspace and note the collection ID and the conversations at issue.
2. Email support@usehearsay.com with the case caption, the court, the hearing or deadline date, and what you need: affidavit, testimony, or both.
3. We confirm scope, timing and the team member who will sign or appear, and deliver the affidavit or prepare for the appearance.

Lead time matters, especially for testimony. Ask as soon as an authentication dispute is foreseeable.

Frequently asked questions

Does every text message exhibit need an affidavit from Hearsay?

No. Most are authenticated by a participant's testimony together with the hashes, audit log and chain-of-custody documentation that come with every collection. An affidavit is for when the process itself is questioned or when you are using a certification-based rule such as FRE 902(13)–(14).

What does the affidavit cover?

How Hearsay's extractor collects messages from the device, how hashes are generated and verified, how the audit log is maintained, and how the exported file relates to the data on the device. It does not address who wrote a message or what it means.

Can a Hearsay team member testify in court?

Yes. Expert testimony about the collection process is available when a matter requires it, in person or remotely as the court permits. Request it early; scheduling depends on the court's calendar and ours.

Do you provide affidavits for email, social media or financial collections too?

Yes. The same process documentation applies across Hearsay's collectors, and affidavits and testimony are available for any of them.

Is Hearsay's documentation enough for FRE 902(14)?

FRE 902(14) requires a certification by a qualified person that the data was authenticated by a process of digital identification, plus advance notice to the other side. Hearsay's hash-verified extraction and a signed certification from our team are designed to meet that structure; your attorney should confirm the notice and timing requirements for your court.