How has the US Supreme Court interpreted the law in determining that statements given by the appellants during their detention were inadmissible?

6 All the appellants urge that their detention was illegal and that any statements given by them during such detention were inadmissible as the statements were taken in violation of their constitutional rights. We find that it is unnecessary to consider these claims as we conclude that on all the evidence, including that so objected to, the government failed to prove the charge of conspiracy. Therefore, we do not pass on the trial judge's ruling, reported at United States v. Bonanno, D.C., 180 F.Supp. 71, upholding the legality of the police procedures.