Jerome Buell Lavay, Disputed Handwriting
“ The moment his back is turned, the layer-down palms the small check and presents the large one. This way of obtaining money is without the assistance of a middle man. Private marks on a check are no safeguards at all, although a great many merchants believe they can prevent forgery by making certain dots, or seeming slips of the pen, which are known only to the paying teller and themselves. This precaution becomes useless when the forger uses the camera. Safe breakers are often called upon by forgers and asked to secure a sheet of checks out of a checkbook. ”
