Which case reinforced the requirement for timely arraignment of suspects?

The case that reinforced the requirement for timely arraignment of suspects is indeed Mallory v. U.S. In this 1957 decision, the Supreme Court addressed the issue of delay in presenting a suspect promptly before a magistrate after arrest. The Court held that such delays could violate a suspect's due process rights. The significance of this ruling lies in the emphasis on ensuring that individuals are not held without a prompt hearing, thereby safeguarding their rights and preventing unlawful detention. This case set a precedent indicating that any unreasonable delay in arraignment could result in evidence obtained during that period being inadmissible in court.

While McNabb v. U.S. also discusses issues related to the timely arraignment of suspects, Mallory is often cited as a more definitive case regarding the necessity of prompt judicial review following arrest, thus further solidifying the requirement for timely arraignment under procedural due process.