i came across an interesting article on HowStuffWorks.com re: police interrogatons in the US.
http://people.howstuffworks.com/police-interrogation.htm
it focuses on the history of police interrogations, Miranda's Rights, and the 9 Reid principles of Interrogaton etc....
anyhow it you get in a jam you should:
be quiet
and ask to speak to an attorney
remember be quiet..
this applies to the US soley, i cannot vouch for Europe, Asia and the Middle East etc..