McCanns: offer to take lie detector test, innocence proven or is it just PR ?

We read that at last Kate and Gerry have volunteered to take a lie detector test.

Innocence proven or is it just PR ?
Update: Utopian friend - 'can't you be a good little citizen & wait to see what comes from the authorities' WHAT ? I live in a democracy with FREEDOM OF SPEECH not an authoritarian state where I wait for what the 'authorities' tell me - think about what you are saying please.
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