"Pooh to you, sir!  I am a lawyer.  A private citizen is required to cooperate with the police under certain specified conditions only.  For example, during hot pursuit - in which case the police officer may still be required to show his credentials.  Is this 'hot pursuit,' sir?  Are you about to dive through this blasted instrument?  Second, a private citizen may be required to cooperate within reasonable and lawful limits in the course of police investigation-"