Gambler's Cop (or Palm) is a card sleight in which a playing card is held deep in the palm. This leaves the fingers free to move.
John J. Crimmins, Jr. in Hugard's Magic Monthly (June, 1954) stated "While the mechanics of the gambler's palm appear upon first reading to be almost impossible to cover up, yet the fact remains that when it's executed perfectly, as I've seen Dr. Daley do, it is absolutely free of detection. Marlo's moves here are his own, and well worth learning.
- Second Method to Palm a Card, page 44 in Ponsin’s Nouvelle Magie Blanche Dévoilée (1853)
- Robert-Houdin's Secrets of Conjuring and Magic (first published in French in 1868 and in English, in 1878). Page 159 of the Routledge edition features a description for palming a back-jogged face card in the action of removing the deck with the other hand.
- Vernon's Mental Card Miracle, Stars of Magic, Series 5, no. 3, 1949.