[thephyber]

> you need to make the statement that you do not wish to answer their questions as explicit as possible

It's also important to phrase it as a declarative sentence (including the correct inflections) and be sure of what you say. If you preface it with "maybe I should..." or "can I have a lawyer?", you are not asserting your right and police are free to continue to questioning you.

I learned all I know about the law from the internet, so it's worth what you paid me to hear it. IANAL