Never let them see where it came from.
Hovland and Weiss identified the sleeper effect in 1951: a message from a low-credibility source is initially discounted, but the discount decays faster than the message. Over weeks, the audience retains the content and forgets why they doubted it.
That decay is the entire technique. If provenance can be severed at the outset, the discount never applies at all.
Operation Denver, chapter 230, is the definitive case. The claim that HIV had been engineered at Fort Detrick was placed in July 1983 as an anonymous letter in Patriot, a small Indian newspaper founded with Soviet assistance. Nothing happened for two years — that is the deposit phase. In 1985 a Soviet paper cited the Indian article as its source. In 1986 an East German biophysicist produced a paper making the argument in scientific form, and the Stasi distributed it. From there it reached newspapers in over eighty countries.
At no point did the claim arrive with a Soviet return address. It arrived as a citation to something published elsewhere.
Each republication adds apparent independence, which is the second mechanism. A reader who encounters a claim in three outlets treats it as three data points, and independence is what makes corroboration meaningful. Where all three trace to one origin, there is one data point wearing three coats — the base-rate error described in chapter 227.
The soft commercial versions are the same instrument: astroturfed blogs, chapter 253; front organizations with citizen-sounding names, chapter 254; undisclosed sponsorship; funded research reported as independent research.
The boundary is disclosure, and it is where most jurisdictions have drawn the line legislatively rather than ethically. Advocating a position you believe is speech. Advocating it while concealing that you were paid to, or concealing that you are a party to the dispute, is what disclosure rules exist to prevent, and the reason is that the audience's evaluation depends on information the technique specifically withholds.
At state level, covert attribution is the standard instrument of the material in Part 8, and its cumulative effect is chapter 231's: not belief in any particular claim but the general cynicism that follows from having been fooled repeatedly.
The counter is chapter 327: leave the page and trace the claim to its earliest appearance.
Countered by Leave the Page