Contact/Contagion Warrant Test¶
Test or assessment — instantiates Associative Transfer Warrant Audit
Distinguishes actual transmission or shared exposure from symbolic contact, mere proximity, or imagined contamination — and bounds any real channel by distance and decay.
Contact/Contagion Warrant Test asks the one physical question the rest of the audit brackets: is there an actual channel along which something moved from source to target, or only the feeling that contact must have transferred it? Its defining focus is on transmission as a real process — a pathogen, a signal, a substance, a defect — as distinct from symbolic contact ("they were in the room"), mere proximity ("they were seen together"), and imagined contamination (the intuition that touching a tainted thing leaves an invisible residue). It does not weigh blame or reputation; it tests plausibility. And when a channel is confirmed, it does the second half of the job — bounding it, because even real contagion decays with distance and time and does not reach everyone who was merely nearby.
Example¶
During a foodborne-illness cluster, two diners who shared a table on the same night both fall ill, and the tempting story is that one gave it to the other. The test refuses the story until a channel is shown. It enumerates candidates: person-to-person transmission (implausible for this pathogen and this timeframe), shared exposure (both ate the raw oysters), and coincidence (each infected independently from the elevated community rate that week). The independence probe checks the last: the base rate is high enough that co-occurrence at one table is not itself informative.
Working the channels, shared exposure via the oyster lot is physically plausible and testable; person contact is not. The scope-and-decay pass then bounds it — the relevant exposure window is 24–48 hours, so a diner three days earlier is out of scope even though they ate at the same restaurant. The conclusion discards the vivid "they were together" association entirely and traces the real channel to the dish, which is where the recall and the tracing effort go.
How it works¶
- Enumerate candidate channels for this domain — direct transmission, shared exposure or common vector, and the null category of symbolic/imagined contact.
- Test each for physical plausibility, not for how strongly it comes to mind. A channel that cannot carry this property in this medium is struck.
- Run the independence probe against the base rate before crediting any channel — co-occurrence at an ordinary frequency is not evidence of a link.
- Bound the surviving channel by distance and decay — steps in the transmission graph, and time since contact — so the finding does not spread past where the process actually reaches.
Tuning parameters¶
- Channel taxonomy — the domain-specific menu of transmission modes considered. Richer menus catch exotic routes but slow every assessment.
- Plausibility bar — how much mechanistic support a channel needs before it is entertained. A high bar rejects imagined contamination; too high dismisses novel-but-real routes.
- Base-rate stringency — how aggressively co-occurrence is discounted against background frequency. High stringency guards against coincidence-as-cause.
- Decay-window width — how far in time and network distance a confirmed channel is allowed to reach. Narrow windows contain overreach; too narrow miss slow or long-range transmission.
When it helps, and when it misleads¶
Its strength is that it cuts both ways against stigma: it debunks imagined contamination — the felt residue that has no channel — while rescuing a real transmission risk that is being waved off as prejudice. This is the psychological law of contagion at work, the intuition that "once in contact, always in contact."[n1]
Its failure mode is over-attribution: a channel that looks plausible gets credited when the co-occurrence is actually driven by a shared background cause, and the mirror error is dismissing an unfamiliar real route because it has no precedent. The classic misuse is treating symbolic contact — someone merely visited a place, or handled an object — as literal transmission. The guarding discipline is that no channel is accepted until it survives the independence probe against the base rate.
How it implements the components¶
transfer_function_hypothesis— states the assumed transmission rule ("the property moves via X") as an explicit, testable proposition.warrant_channel_separation— sorts real transmission and shared exposure apart from symbolic or imagined contact.scope_decay_and_distance_boundary— bounds a confirmed channel by transmission distance and time-since-contact so it does not over-reach.independence_and_confounding_probe— checks the association against base rate and common cause before any channel is credited.
It does not name the property and record a permitted decision (the Association-to-Evidence Matrix), weigh reputational harm (the Guilt-by-Association Review), or separate status and aesthetic spillover (the Halo and Taint Decomposition Table).
Related¶
- Instantiates: Associative Transfer Warrant Audit — this test resolves whether an association is a real spread process.
- Sibling mechanisms: Association-to-Evidence Matrix · Guilt-by-Association Review · Halo and Taint Decomposition Table · Endorsement Scope Checklist · Trust Transitivity Breakpoint Review · Category-Membership Attribution Audit · Associative Claim Red Team
Editorial Notes¶
Form Classification¶
Form family: Assessment, Review & Assurance
Rationale: Distinguishes actual transmission or shared exposure from symbolic contact, mere proximity, or imagined contamination — and bounds any real channel by distance and decay, making its operative form a bounded evaluation of existing evidence or work that produces a finding or disposition.
Independent corroboration: The frozen evidence defines Contact/Contagion Warrant Test as 'Distinguishes actual transmission or shared exposure from symbolic contact, mere proximity, or imagined contamination — and bounds any real channel by distance and decay', so its operative form is Assessment, Review & Assurance.
Review outcome: Independent reviewer agreement; high confidence.
Origin Attribution¶
Primary origin: Psychology
Origin pattern: Cross-disciplinary synthesis
Present-day reach: Multi-domain
Rationale: Psychological research on magical contagion cohered the diagnostic need to separate a felt residue of contact from evidence of actual transfer.
Related originating lineages:
- Medicine & Healthcare — Epidemiology contributes explicit transmission channels, shared exposures, and distance-time bounds for genuine contagion.
- Sociology & Anthropology — Frazer's study of sympathetic magic supplied the older 'once in contact, always in contact' lineage.
Review resolution: Magical-contagion psychology supplies the diagnostic contrast, while epidemiology and anthropology supply genuine lineages for real transfer and symbolic contact; the integrated warrant test remains synthesized.
Encyclopedia synthesis: The exact catalogued form synthesizes established practice rather than reproducing a single standard historical label.
Review outcome: Reconciled after independent review; medium confidence.
Notes¶
[n1] The law of contagion — "once in contact, always in contact" — is one of the laws of sympathetic magic catalogued by James Frazer and revived in psychology by Paul Rozin's studies of magical contagion, in which objects that merely touched a source are treated as if they carry its essence. The test's whole point is to separate that felt residue from an actual transmission channel. ↩