Unless, of course, they told the feds that it was actually Jussie who mailed the thing. "Oh, what a tangled web we weave when first we practice to deceive..."
Could have been Jussie himself(The white substance turned out to be tylenol that was crushed) but even if it was NOT Jussie himself, if he told the brothers to mail it they did it on HIS behalf that itself is a federal offense