Introduction

On Dan McClellan’s recent Shroud of Turin post (#maklelan3227) on Facebook, I kept seeing comments like:

“Now they have to prove how it was made, and replicate it.” “Explain how it’s done (no one can…)” “The STURP scientists have no idea how it was made…”

This move appears in Book of Mormon origin discussions as well. It shifts the burden from evidence to mechanism, treating the absence of a complete explanation as evidence of authenticity.

A successful replication (or historically plausible mechanism) does increase the credibility of a forgery hypothesis. But the inverse claim requires qualification.

In probabilistic terms, evidence favors one explanation over another only when it is more expected under that explanation. Failure to replicate supports authenticity only if it is more expected given authenticity than given forgery. That condition is rarely demonstrated.

Failure to replicate is not surprising under most forgery hypotheses:

  • the space of possible methods is large and incompletely explored
  • key constraints (materials, environmental conditions, tacit knowledge) may be missing
  • replication targets are often underspecified
  • reverse-engineering can be harder than original production

So failure to replicate is usually weak or non-discriminating evidence.

Qualification

Failure to replicate is not always irrelevant. It carries evidential weight when:

  • the target is clearly specified
  • the relevant method space has been thoroughly explored
  • and replication should be feasible given what we know

Those conditions are rarely met in these discussions, but they are the standard required for the argument to work. This is a version of the argumentum ad ignorantiam (appeal to ignorance): treating a lack of disproof as proof.

The Book of Mormon case (two distinct replication demands)

In BoM discussions, the replication challenge typically appears in two forms:

(1) Reproducing the plates

Show how Joseph Smith (or a contemporary) could have produced plates consistent with the description using available materials and techniques.

Even if no one has done this convincingly, the evidential force is limited. It supports authenticity only if failure to reproduce the plates is much more expected if the plates were genuine than if they were fabricated.

But under a fabrication hypothesis, failure here is not surprising:

  • the descriptions are sparse and partly secondhand
  • the target is underspecified (size, composition, engraving details)
  • the relevant craftsmanship constraints are unclear
  • many plausible fabrication strategies remain unexplored

So the failure does not strongly favor authenticity.

(2) Reproducing the dictation process

Produce a comparably long, structured text (~500+ pages) in ~65 working days, orally, without notes.

This is a stronger case, but still limited. The core weakness is that it assumes we know how difficult this task is under natural conditions.

For failure to replicate this feat to support authenticity, we would need to show that such performance is extremely unlikely under natural explanations. That is difficult to establish because:

  • the comparison class is small and poorly characterized
  • human cognitive performance has high variance (some individuals produce unusually large or complex works under constraints)
  • the exact historical constraints (“no notes,” process details) are uncertain
  • partial analogues exist (oral composition, dictation, rapid drafting), even if not exact matches

So while the dictation is unusual, failure to replicate it does not strongly distinguish between competing explanations.

Comparative evidential weight

The main weakness in replication arguments is that they are typically used in place of stronger, more direct evidence.

For both the Shroud and the Book of Mormon, independent lines of evidence bear directly on origin:

  • Shroud: carbon dating, textile analysis, historical context
  • Book of Mormon: KJV dependence (including translation artifacts), anachronisms, copious 19th-century theological content

These more directly discriminate between hypotheses, whereas replication failures usually do not.

Conclusion

Absence of a known mechanism is not, by itself, strong evidence for authenticity.

More precisely:

Failure to replicate only has evidential force if we have good reason to think that a non-authentic explanation should be replicable under the conditions tested. In most cases, including the Shroud and the Book of Mormon, that condition is not met, so the evidential value of replication failure is limited.