Fact-Checking for Documentary Filmmakers in the Age of AI
Let's get it right!

As documentary filmmakers, journalists, and storytellers, we have a responsibility to gather, interpret, and share information accurately and fact-checking is a vital part of the process.

That has always mattered, but it matters even more now.

Documentary research no longer just means checking whether a source looks respectable or a statistic seems plausible. We are working in a landscape of clipped context, recycled social posts, manipulated media, and AI tools that can sound convincing while still getting key details wrong.

Why Fact Checking Is Important

"We are dealing with volatile raw material. Handled carelessly, the facts we uncover, research and present have the power to cause misunderstandings, damage and could, potentially change the course of history," says David Brewer, a media consultant and founder of Media Helping Media.

If you have hopes of getting your documentary on Netflix, pitching to broadcasters, festivals, funders, or simply building trust with your audience, your facts need to hold up!

Here are some practical fact-checking tips to keep in mind as you are making your documentary and gathering information for your film.

Journalism 101: Best Practices For Sourcing

Whenever possible, go back to the original source.

That might mean the full interview instead of a clipped quote, the court filing instead of an article about the case, or the original research paper instead of a headline summarising it.

Secondary coverage can help, but it should not be where your research stops. If a claim matters to your film, trace it back to where it began.

Then verify it against multiple independent, CREDIBLE sources. A useful rule of thumb is to check important claims against at least three genuinely separate sources, not just three websites repeating the same thing.

The more sensitive, controversial, or reputationally risky the claim, the higher your standard of fact-checking should be.

What Is A Credible Source?

Well, that depends on what kind of information you're gathering. An eye witness to an event is a credible source to help piece together what happened at that event, but an eye witness is not necessarily a credible source for providing context on why that event occurred.

Or what about medical information. Is a study on 10 people by a company who profits from the study results credible? Probably not. What about a government study over a time period of 20 years with 100,000 people and no profit motives. Maybe that one's more credible? The only way to know is to check with multiple people who are experts in their field and have no connection with your other sources.

By talking with all these independent sources you can begin to get an accurate picture of the truth.

Use AI as a research assistant, not an authority

AI can save time. It can help you brainstorm search terms, organise notes, summarise documents, compare themes, and suggest follow-up questions.

What it cannot do is remove your responsibility to verify.

A useful mindset is this: AI tools like ChatGPT, Claude or Gemini can help you find leads, but they are not a source.

NotebookLM can be especially useful once you are working with your own source material, such as transcripts, PDFs, reports, articles, or notes. Because it draws from what you upload, it can help you compare sources, spot patterns, and check where a claim came from.

Still, the same rule applies: do not use AI output as proof. Use it to support your research process, then go and check the original material yourself.

Learn how to use AI in your documentary: Documentary Filmmaker's AI Playbook

Attribution and Transparency

In good journalism, it’s important to share with the viewer/reader where your information originated.

This not only provides your story with credibility, but allows the viewer to make up their own mind on the credibility of the information.

As part of your research, keep good notes (ie. Google doc spreadsheet) so that you can always quickly reference all your material.

This becomes especially useful later, when you are writing treatments, editing scenes, checking lower-thirds, or responding to questions from collaborators, lawyers, broadcasters, or funders.

Fact vs. Opinion

A fact is information that can be proven as true or false (2 + 2 = 4).

An opinion is an expression of a person’s feelings which may or may not be based on fact (“that building is going to collapse”).

An allegation is a claim that has not been proven.

And “spin” or "propaganda" is when certain pieces of information are pieced together in such a way to make you believe something is true.

Strong documentary storytelling often contains all four. The danger comes when they get blurred together.

Polls, Studies and Statistics

It’s an amateur mistake to believe that the results from a study or statistics are facts.

Beware that studies can be misleading and easily manipulated.

It’s absolutely essential to know WHO conducted the study and their motivation.

Who PAID for the study.

How LONG, over what period of time, was the study conducted.

HOW MANY people were involved in the study?

HOW was the information gathered?

What is the CONTEXT of the information?

And many other such questions.

For example, a study conducted by a pharmaceutical company on the effects of one of their drugs should be examined with much skepticism.

Be Aware Of Your Own Biases

Have you already made up your mind about how your documentary is going end?

Have you come up with pre-determined conclusions before investigating the facts?

If so, be aware of these biases and push yourself to seek alternative viewpoints.

The film (and your journey making it) will be much richer if you can approach the project with hyper curiosity and as an explorer on a mission of discovery.

Quick fact-checking checklist

Before you lock a claim into your treatment, script, voiceover, or final cut, ask:

What exactly is the claim?
What is the original source?
Have I checked it against at least two more independent sources?
Is this fact, opinion, allegation, or interpretation?
Have I checked the quote, spelling, title, date, and context?
If a visual is being used as evidence, have I verified the visual itself?
If AI helped me find it, have I checked it outside the AI tool?

AI can help you move faster and it can help you search more broadly and organise material more efficiently, but it cannot replace editorial judgment and fact-checking fundamentals.

The basics of good documentary research still apply: verify, compare, question, log, and check again.

That is how you protect your film, your subjects, and your credibility.