trick or treat
n.— «The most intriguing role in the 66-minute film goes to the unseen informant who supposedly led the cops to the wrong address, where Mena was killed. The snitch offers insight into a practice called “trick or treat,” in which he bought drugs anywhere he could find them, then gave the drugs to Denver police, who used them as the evidence for warrants to search wherever they chose.» —“Film on police killing a must-see” by Jim Spencer Denver Post (Colorado) Apr. 13, 2007. (source: Double-Tongued Dictionary)
Further reading
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