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Graffiti continues to be used as a written form of communication between street gangs. An observant patrol officer can read graffiti and collect valuable information about past, current and future gang activities. Graffiti can be used to mark off turf boundaries, give insults to rival gangs, act as a warning of impending death, list fallen comrades, announce the presence of a gang in a certain area of the city or show gang alliances. Editor's Note: Images contain profanity.