Timothy Kephart's analysis of some 450 gang graffiti photographs in the Carson area revealed 5 forms of graffiti communication: "publicity," "roll call," "territorial," "threatening," and "sympathetic." "Publicity" gang graffiti, the most frequent type, contains the name or abbreviation of a gang. "Roll call" graffiti, the next most frequent type, contains the gang name and a list of gang monikers. "Territorial" graffiti, the third most frequent type, contains a symbol that marks a gang's territory, typically in the form of an arrow pointing down. "Threatening" graffiti, which composes only 9 percent of graffiti, contains some sort of threatening message to a rival gang or to police. "Sympathetic" graffiti, the least observed, honors a slain gang member, usually in the form of an "RIP." This article explains how each of these types of graffiti can be useful to police and prosecutors in gang-related cases. Kephart's research led him to develop two software tracking packages: Graffiti Analysis/Intelligence Tracking System (GAITS) and Vandal Apprehension/Graffiti Reduction Program (VanGraff). GAITS extracts intelligence information from graffiti photographs and stores it in conjunction with the photo. This article explains how Kephart's methods of comparing graffiti to known gang members in Carson led to the dismantling of the second largest graffiti ("tagging") crew in the area.