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the claim

The Exorcist is based on a true story.

the verdict
INSUFFICIENT LEANING
Recorded sources
7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the Exorcist is based on a true story?

Unclear. Several reference works indicate the novel and film The Exorcist were inspired by a documented 1949 exorcism case (the St. Louis/Roland Doe possession), but they also note the story departs substantially from that case and much of the surrounding account is undocumented hearsay. No retrieved source settles the claim at full strength.

Verdict: PARTIAL LEAN · 7 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 7
Heartland
2005
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Neil, C. (2005). Heartland. archive.org. https://archive.org/details/heartland0000cros

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More for · 6
Heartland A Memoir
2015
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author, C. N. (2015). Heartland A Memoir. archive.org. https://archive.org/details/heartlandmemoir0000cros

Path Through Scripture: From Genesis to Revelation
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Link, M. (n.d.). Path Through Scripture: From Genesis to Revelation. archive.org. https://archive.org/details/paththroughscrip0000mark

What is an overview of how different Christian denominations deal with demon possessions?
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What is an overview of how different Christian denominations deal with demon possessions?. (n.d.). christianity.stackexchange.com. https://christianity.stackexchange.com/questions/81001

the-encyclopedia-of-demons-and-demonology 202509
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the-encyclopedia-of-demons-and-demonology 202509. (n.d.). archive.org. https://archive.org/details/the-encyclopedia-of-demons-and-demonology_202509

Exorcism of Roland Doe - Wikipedia
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Exorcism of Roland Doe - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Exorcism_of_Roland_Doe

the-encyclopedia-of-demons-and-demonology-guiley-rosemary-ellen
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the-encyclopedia-of-demons-and-demonology-guiley-rosemary-ellen. (n.d.). archive.org. https://archive.org/details/the-encyclopedia-of-demons-and-demonology-guiley-rosemary-ellen

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held for human review16 Oct 2026
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