 Shonubi was a member of the reference class “people found carrying heroin while traveling between Nigeria and New York” but also the class “toll collectors at the George Washington bridge”. Why rely on the former and not the latter to make inferences about how much heroin Shonubi smuggled into the United States? (Colyvan, Regan, and Ferson 2001). What follows examines the specific difficulties that the reference class problem poses for legal probabilism and how legal probabilists might respond.