does a jury all have to agree on a verdict
Hung jury In the United States, the result is a mistrial, and the case may be retried (United States v. Perez, 1824). Some jurisdictions permit the court to give the jury a so-called Allen charge, inviting the dissenting jurors to re-examine their opinions, as a last-ditch effort to prevent the jury from hanging. The Federal Rules of Criminal Procedure state, "The verdict must be unanimous. . . . If there are multiple defendants, the jury may return a verdict at any time during its deliberations as to any defendant about whom it has agreed. . . . If the jury cannot agree on all counts as to any defendant, the jury may return a verdict on those counts on which it has agreed. . . . If the jury cannot agree on a verdict on one or more counts, the court may declare a mistrial on those counts. A hung jury does not imply either the defendant's guilt or innocence. The government may retry any defendant on any count on which the jury could not agree."[8]