In of Rizzoli & Isles , titled " Judge, Jury and Executioner ," the "piece" of evidence that proves critical to solving the case is a dab of wet paint .

: A small amount of wet paint on the judge's hand leads detectives to a freshly painted railing in a stairwell, identifying the exact location where she was ambushed.

: The judge had discovered that a private prison, to which she had been sending young offenders for rehabilitation, was actually a dangerous facility for "hard-core gangbangers".