Researchers propose a study of the best methods for collecting and processing fingernail evidence. Specifically, researchers plan to compare and subsequently optimize methods for obtaining cells/DNA from fingernails so as to maximize the yield of foreign DNA while minimizing that from the tested individual; compare and subsequently optimize DNA typing techniques such that the best method(s) is (are) used for fingernail DNA evidence; compare and subsequently optimize methods for nail collection and storage for ease of obtaining viable and accurate DNA data while minimizing effort, DNA loss, and cross contamination. ca/ncf