You mean like anyone with IQ say below 120 should not be allowed to vote? Who will have the authority to police it? Who will have the authority to write the tests?

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My Demon revokes any prayer
He's grown contempt for love and hope
He betrays trust, twists truth and fair
Indifference is his way to cope
Engulfing sound of sensations
He quells with voices of despair
And muse of short lived inspirations
Flees at the sight of his cold stare
~Moy Demon - Mihayeel Lermontov~