Secret peeking technique [Tutorial]

This technique allows the magician to know what card the spectator is thinking of. This peek is quick, practical, and incredibly useful. You can have someone freely choose a card, and then immediately shuffle if they desire. You have already secretly seen their card at this point so it's easy to recover control over it and carry on with whatever trick you want.
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▼ Credits/Sources
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This is a variation on a peeking technique I read in the Fingertip Control chapter of Ed Marlo's Revolutionary Card Technique.