Merely recognizing that a motorist is not obliged to cooperate with a police investigation, however, grants the citizen little security given the setting within which the questioning occurs. Understandably, the average motorist will hesitate to invoke this "right not to respond" to police questions and "requests" to perform so-called coordination tests. A late-night confrontation with an armed police officer will normally induce cooperation from all but the boldest citizens whose main concern is to appease the officer and avoid "trouble."
Indeed, the consequences of non-cooperation are undoubtedly understood to be further coercive detention. While this is, unfortunately, not unlikely to occur, it is, nevertheless, often advisable that the motorist insist on invoking his or her rights.
Lessons cost money. Good ones cost lots. -Tony Beets