CARDS EXPOSED BEFORE PLAY
67. If, after the deal has been completed and before the trump declaration has been made, either the dealer or his partner expose a card from his hand, the eldest hand may, without consulting with his partner, claim a new deal.
68. If, after the deal has been completed and before a card is led, any player shall expose a card, his partner shall forfeit any right to double or redouble which he otherwise would have been entitled to exercise; and in case of a card being so exposed by the leader’s partner, the dealer may either call the card or require the leader not to lead the suit of the exposed card.