Moving the Goalposts
LogicalChanging the criteria for proof or acceptance after the original criteria have been met. When evidence meets one demand, a new demand is introduced.
Example
Asking for evidence of the Moon landing, then dismissing photos as fabricated, then dismissing rock samples as terrestrial.
Theories on Conspirafy that exhibit this fallacy
- The Moon Landing Hoax — When photos are explained, demand for "independent" verification; when LRO shows sites, claim photos are faked too