Resurrecting an old thread in light of recent events:

From the New York Times 1st June 2010

"A suspect who has received and understood the Miranda warnings, and has not invoked his Miranda rights, waives the right to remain silent by making an uncoerced statement to the police”

- quote from Supreme Court Judge on a recent decision.

In other words if you want to remain silent you have to speak up!
Else an unthinking answer you give in response to questioning (easier to do than you think), can be used against you. Say "I wish to remain silent".
The Sock
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The world is in haste and nears its end – Wulfstan II Archbishop of York 1014.