You may have noticed that in fiction, cops seem to drink nothing but coffee. Compare Donut Mess with a Cop, which may appear in conjunction with this trope.
Examples
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TV — Live-Action
- Lethal Weapon (2016): Riggs and Murtaugh are never shown drinking anything other than black coffee.
Western Animation
- The Simpsons: It's implied that coffee is Chief Wiggum's favorite drink.
- Averted in South Park. Officer Barbrady mentions that he doesn't drink coffee, saying that he prefers to be hit in the face with a cat to wake up.