McNabb–Mallory rule.Criminal procedure. The doctrine that a confession is inadmissible if obtained during an unreasonably long detention period between arrest and a preliminary hearing. • Because of the broader protections afforded under the Miranda rule, the McNabb–Mallory rule is rarely applied in modern cases. McNabb v. United States, 318 U.S. 332, 63 S.Ct. 608 (1943); Mallory v. United States, 354 U.S. 449, 77 S.Ct. 1356 (1957). — Often shortened to Mallory rule.

[Cases: Criminal Law 519(8). C.J.S. Criminal Law §§ 929–930.]

[Blacks Law 8th]