On October 9, the Iowa Supreme Court affirmed a conviction in State v. Amyda after rejecting challenges to the authentication of a digital video and the admission of a duplicate under the best-evidence rule.

The defense argued that the video was vulnerable to deepfake technology. The court found that the surrounding circumstances and distinctive details were enough to authenticate it. It also held that speculation about a deepfake, without supporting evidence, did not raise a genuine question about authenticity.

The decision leaves room for real deepfake challenges. A party needs more than the general possibility of AI manipulation when challenging particular evidence.

That distinction matters for Iowa litigation teams. If a firm may need to authenticate or challenge digital media, the useful work begins before the hearing.

Authentication does not depend on one technical path

There was no chain-of-custody evidence connecting the video in Amyda to the defendant. The victim was asleep during the events shown and could not testify that she watched them happen. Law enforcement was unable to retrace the video’s digital path.

Even with those gaps, the court found sufficient circumstantial evidence under Iowa Rule of Evidence 5.901. The victim identified the room, furnishings, clothing, parts of her body, and the defendant’s hand. Those details matched the surrounding circumstances.

The Iowa Supreme Court’s opinion explains that no particular method is required to authenticate a video. Its appearance, contents, internal patterns, distinctive characteristics, and surrounding circumstances may be considered together.

That is useful for firms handling files that arrived through text messages, social media, cloud sharing, or client devices. Missing metadata or an incomplete digital trail does not settle the authentication question, but it makes contemporaneous collection records more valuable.

The court rejected a general claim about what AI can do

The defense pointed to public examples of deepfake videos and argued that modern technology can manipulate a video to look like almost anything. The court described that argument as conjecture because it was not tied to evidence that this video had been fabricated.

The opinion discussed the “liar’s dividend,” a term for using public awareness of deepfakes to cast doubt on authentic material. If every real recording becomes suspect merely because a convincing fake is possible, fabricated evidence is not the only problem. Genuine evidence becomes easier to deny.

The court also noted a proposed Federal Rule of Evidence 901(c). Under that proposal, a party alleging generative-AI fabrication would first need to produce evidence sufficient to support a finding of fabrication. The proponent would then have to show that the item was more likely than not authentic.

That federal proposal is not an Iowa rule. The Iowa court cited it while explaining why the existing best-evidence rule already required a genuine question rather than a theoretical possibility.

Deepfake detection still has a role

The holding was specific to the record in Amyda. The opinion contrasted the case with a 2026 New York decision involving videos obtained by a self-described hacker, where identifiable circumstances did raise questions and authentication was inadequate.

A challenge may look different when the file has unexplained edits, conflicting timestamps, an implausible source, inconsistent visual or audio details, or a collection history that contradicts a witness. Expert analysis may uncover encoding, metadata, or content evidence that gives the court something concrete to evaluate.

The team should be prepared to connect its concern to the actual file and facts. A general warning about what deepfake software can do will not establish that a particular recording was altered.

That requires a different process from the one discussed in our article about an AI-generated victim video used at sentencing. That case involved acknowledged synthetic material and whether the court should have considered it. Amyda involved a claim that disputed evidence might have been fabricated.

Preserve the first available copy

When digital media may matter, preserve the version received before uploading it to an editing tool, messaging platform, or online detector. Those services may recompress the file, remove metadata, or create a new version that is harder to compare with the source.

Record where the file came from, who collected it, when it was received, and what device or account held it. Preserve related messages, links, platform notices, and witness information. If possible, calculate a cryptographic hash so the team can later show whether the preserved copy changed.

These operational safeguards are not legal requirements for every Iowa case. They give attorneys and forensic professionals better material to evaluate.

The case-management record should also distinguish between the original source, the preserved working copy, and any edited or converted versions prepared for review or presentation. A descriptive filename alone is not enough when several exports look identical.

Escalate on facts, not suspicion

Firms need a threshold for involving qualified forensic help. A high-stakes matter may justify early assistance even before anyone spots an obvious anomaly. In other matters, the team may escalate after finding a specific reason to question the file.

Potential triggers include:

Metadata that conflicts with the claimed date, device, or software
Missing source files when the person offering the evidence should control them
Visible or audible inconsistencies that survive ordinary playback checks
A platform history that does not match the account given by a witness
Signs of editing that nobody can explain
A credible disclosure that generative or editing tools were used

An online deepfake detector may provide a lead, but it should not become the firm’s only analysis. Detection products can disagree, and recompression can affect their results. The team needs to understand the method and limitations behind any conclusion it plans to rely on.

Test both sides of the process

A litigation team should be able to answer two sets of questions.

If the firm offers the media, who can explain what it is, where it came from, and why its distinctive details and surrounding circumstances support authenticity? What original files and collection records are available?

If the firm challenges the media, what specific fact suggests alteration or fabrication? Which file was examined? What analysis supports the concern? What additional source material should be requested?

State v. Amyda leaves deepfake disputes tied to evidence. Firms that preserve the source and document the collection process will be in a better position, whichever side of the authenticity question they face.

If digital evidence reaches your matters through phones, cloud links, and messaging apps without a consistent preservation process, Artech can help document the collection, storage, access, and escalation workflow.