Some plants are in reality inmates or prisoners of war who have been promised better treatment and conditions in return for helping with the interrogation; the character played by William Hurt in the film Kiss of the Spider Woman is an example of this.
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In his book Fake: Forgery, Lies, & eBay, Kenneth Walton describes how he and his cohorts placed shill bids on hundreds of eBay auctions over the course of a year.
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The title of one of Erle Stanley Gardner's mystery novels, Shills Can't Cash Chips, is derived from this type of shill.