The handwritten signature is the most widely employed source of secure identification in the United States, especially for cashing checks, and verifying credit card transactions. Currently, all signature verification is based on visual inspection by a teller or a store clerk. Previous successful techniques for forgery detection have primarily been on-line techniques. This research is an extension of the first author's work on forgery detection and describes an algorithm to detect forgeries perpetrated by using a tracing paper or a glass plate. This algorithm is very successful when used in conjunction with the algorithm developed earlier by the first author.