It is also possible to identify the particular machine used by examining the pattern of unique and identifiable “trash marks.” Trash marks are uniquely identifiable markings on copies (e.g., specks, spots, streaks, or edge markings). Fraud examiners can identify a particular machine by examining the trash marks left on copies and comparing the marks with copies from a known machine. The fraud examiner should be aware, however, that some of these markings are permanent while others are transient and temporary.