Whisperer's Secret

I've always, always wondered... can mute people whisper? Because, once you really think about it, when we whisper, we don't really use our voices. I've searched Google and I've seen 'no, they can't whisper' a few times. Originally I thought that being mute means that your voice box is no longer working, or is damaged. Well, if this were true, then I believe that whispering is possible for mute. But is it really? Do you think they can whisper?