When you're truly in a narcotic task force's crosshairs, they might give you a signal in the form of a simple rhyme: "Give us three, and we'll set you free." This couplet, most effective when recited by an agent perched on the lip of his chair, muscles tensed and ready, should be interpreted to mean that if you incriminate a handful of marbles law enforcement would rather play with, they'll drop those pending drug charges. And in an era of federal mandatory minimums that work like dispassionate Pez Dispensers handing out tart, 10- year prison bids for such crimes as, say, thinking about dealing America's most commonly used illicit drug, marijuana (a decade for planning, not selling), getting a suspect to "flip" on someone else can be a process smoother than photosynthesis.

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