You have never before seen -- nor will you ever see again -- FBI director Robert Mueller so thoroughly humbled in a discussion about drug policy before the United States Congress.

In this instance, Rep. Steve Cohen (D-TN) gets Mueller to admit that marijuana has never killed anybody, then smashes into tiny bits the decades-old "gateway drug" argument with a unique analogy of milk and bourbon.

This video is from CNN, broadcast May 20.

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As my friend Christopher Largen once opined with iconoclasm: "If cocaine dealers were the nation's only source of coffee, a cup of Joe would soon be considered a gateway mug."