The Mentalist Season 2, Episode 23: "Red Sky in the Morning"
In "Red Sky in the Morning", the May 2010 second-season finale of The Mentalist, the hero Patrick Jane's nemesis Red John quotes Blake's poem "The Tyger". "Red Sky at Night", which opened the third season in Sept. 2010, finds Jane reading a text-only version of Blake's Songs of Innocence and of Experience, specifically the poem "The Divine Image". The Songs collection contains both poems. In Season 6 of The Mentalist Patrick Jane discovers a conspiracy of corrupt police officers and law enforcement named after William Blake that call themselves "The Blake Association" -Wikipedia