"By a 5-4 vote, the justices said that once rights have been read and questioning begun, a suspect must clearly declare that he wants to remain silent and canno

"By a 5-4 vote, the justices said that once rights have been read and questioning begun, a suspect must clearly declare that he wants to remain silent and cannot simply be silent." First, that's some twisty logic; in order to be silent you must first not be silent. But what's really puzzling is that you can be told, "You have the right to remain silent ...", yet not have the right to remain silent.