Reasoning pattern · conspiracy reasoning

Absence-of-evidence inversion

Absence-of-evidence inversion converts a lack of expected supporting evidence into support for the claim by asserting concealment, suppression or destruction without independent evidence for that additional explanation.

Also known as: evidence suppression inversion

Missing evidence can sometimes be explained by concealment, but that explanation needs its own evidence. Otherwise the claim becomes harder to falsify precisely when its expected evidence fails to appear.

In practice

Claims using this reasoning pattern

Unsupported Reviewed Sep 30, 2026

Are chemtrails a secret large-scale spraying program?

Persistent contrails are a documented atmospheric phenomenon: aircraft exhaust can form ice-crystal clouds that persist and spread when the upper atmosphere is sufficiently cold and humid. Real cloud-seeding and geoengineering research also exist, which is an important source of confusion. But those activities are distinct from ordinary high-altitude contrails. Expert surveys, aviation and atmospheric evidence, and current government documentation do not establish a covert large-scale spraying program hidden inside normal commercial-aircraft contrails.

conspiracy theories

Unsupported Reviewed Sep 30, 2026

Did modern electronics come from recovered alien technology?

The best-known version of this claim comes from Philip J. Corso's 1997 memoir The Day After Roswell. The technologies he linked to recovered alien hardware have extensive, independently documented scientific and engineering lineages: semiconductor research led to the transistor in 1947, the integrated circuit followed from transistor and planar-process work in the late 1950s, lasers grew from maser and stimulated-emission research, and practical optical-fiber communication emerged from documented work on low-loss glass. No independently verifiable artifact, laboratory record or technical transfer chain has established an extraterrestrial origin for those technologies.

conspiracy theories technology radiation