My understanding is that a Dennis hearing is a type of evidentiary hearing. The rules are the same as for any other evidentiary hearing, except where there is case law applying specifically to Dennis hearings.
(My spellchecker doesn't believe in 'evidentiary' or 'declarant'. I wonder if I can give it a law dictionary for Christmas?)
I agree it's a type of evidentiary hearing, but I'm not sure that completely answers the question of what rules apply. In a case I've mentioned before, McDaniel v. State
, the 2nd DCA held that hearsay evidence that didn't meet the statutory exceptions wasn't admissible at Dennis hearings, even though it is admissible at suppression hearings, which are also a type of evidentiary hearing. That said, I have no reason the think the rule I mentioned above applies to immunity hearings
In the Firefox spellchecker, it's easy to add words to the dictionary. Just right click and choose "Add to Dictionary." If you're using something else, I'm afraid you're on your own.