Quote Originally Posted by Uchiha Barles View Post
Once you're told you have the right to remain silent, remaining silent should itself be the invocation of that right. What this is, is a yet another small way for authorities to assert that they hold power over you. A small, little thing to help the person being arrested to know his/her place. Perhaps even a tiny step towards further erosion of rights. In and of itself though, it's not a big deal.
How else can you confirm that they understand their right to remain silent unless they verbally acknowledge that they understand it?