without unnecessary delay
Defined in 1 dictionary — Case Law
Definitions from Case Law
United States Supreme Court
Circumstances may justify a brief delay between arrest and arraignment, as for instance, where the story volunteered by the accused is susceptible of quick verification through third parties. But the delay must not be of a nature to give opportunity for the extraction of a confession.
Defined by the Supreme Court in - Mallory v. United States, 354 U.S. 449 (1957).