"Someone (I don`t remember who exactly - maybe user BlackCat) wrote it is untrue."
Just because he says so, doesn't mean it is true. But is not just a matter of what they are legally allowed to say, but what is legally prudent to say. Someone who is a defendant in a criminal proceeding can spill his beans if he wants to but it is not the most prudent thing to do:
http://www.youtube.com/watch?v=6wXkI4t7nuc