Whether Federal Rule of Criminal Procedure 14 requires severance whenever properly joined codefendants present mutually antagonistic defenses.
Holding
No. Mutually antagonistic defenses are not prejudicial per se, and Rule 14 does not impose a bright-line rule requiring separate trials whenever codefendants blame one another.
Reasoning
Rule 8(b) permits joint charges against defendants alleged to have participated in the same act, transaction, or series of transactions. Federal law generally favors joint trials of properly joined defendants because they promote efficiency, avoid repetitive proceedings, and reduce the risk of inconsistent verdicts.
Rule 14 recognizes that proper joinder can nevertheless create prejudice. But its text gives the district court discretion to select an appropriate remedy, including severance or another form of relief. It therefore does not make severance automatic even when some prejudice is shown.
The governing question is whether a joint trial creates a serious risk of compromising a defendant's specific trial right or preventing the jury from making a reliable judgment about guilt or innocence. The answer depends on the circumstances of the particular case, not merely on the label attached to the defenses.
Such prejudice can arise, for example, when evidence admissible only against one defendant improperly affects the jury's consideration of another, when a joint trial presents a Bruton-type confrontation problem, or when essential exculpatory evidence would be unavailable in a joint trial. In a complex case with many defendants and sharply different levels of culpability, spillover prejudice may also be especially serious.
Even where a risk of prejudice exists, severance is not invariably necessary. District courts may use less drastic measures, especially limiting instructions directing the jury to assess the evidence separately as to each defendant.