[ClearCase_guy]

Most people are a bit brighter than you seem to think.

"Good afternoon officer."
"No, I don't know why I'm being stopped."
"Here are my license and registration."
"Thank you."

These are a just a few things that any intelligent person is willing to say to a police officer. It can make a routine traffic stop go pretty smoothly.

"No, you cannot search my car."
"Do you have a warrant?"
"Am I being arrested?"

These are more phrases that can come in handy. The key idea is that making speeches about your innocence, providing helpful information and showcasing the fact that you have nothing to hide, are a model citizen, and have done nothing wrong -- this is just stupid behavior. It's much smarter to say as little as possible.

You seem to think that people are being advised to "play deaf mute". That is not the case.

[HiTech RedNeck]

I took him at face value... he never talks to a cop. If he later modifies that, he’s a worm and I don’t want advice from worms.

[Jack Hydrazine]

The WRONG way to handle a police stop.
http://www.youtube.com/watch?v=KaCe6nQUX5c

The RIGHT way to handle a police stop.
http://www.youtube.com/watch?v=eDJrQBwJpqk

How to Refuse a Police Search
http://www.youtube.com/watch?v=nyokKFIecIo