Police suspect that Butch Cassidy and the Sundance Kid robbed the Union Pacific Railroad. They bring in Butch for questioning. They don't give him his Miranda warnings. During the questioning, he says: "OK, Ok, I confess. Sundance and I robbed the train." The statement was made volutnarily, but since Butch was not given his Miranda warnings, it can't be used against him at trial. Can it be used against Sundance? Explain your answer.