McNabb v. United States is a 1943 U.S. Supreme Court ruling that requires all persons arrested under federal criminal violations to be brought promptly before a committing federal magistrate for an initial appearance. This decision, along with the U.S. Supreme Court rulings in Upshaw v. United States (1948) and Mallory v. United States (1957), led to the McNabb-Mallory doctrine, which excludes from federal criminal proceedings confessions obtained after an “unnecessary delay” in presenting a person arrested before a federal magistrate. Although the McNabb-Mallory ...

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