Constable Flint was on guard in the room on one side of the Patrician during the unfortunate arsenic incident. He apparently took up a post in the Watch after his career in moving pictures ended so suddenly. He also momentarily halted the practice of ascertaining what a substance is by dipping a finger in it and then gingerly tasting it; he tried this on a blackmarket consignment of ammonium chloride cut with radium, and then had to spend three days tied to his bed until the spiders went away.