As tattoos become more and more common it is important to distinguish the non-criminal tattoos from the tattoos that are commonly displayed by the criminal underworld. This course will extensively examine tattoos and intelligence that can be gathered by correctly identifying tattoos on the numerous criminal and extremists' groups that exist worldwide. It will examine generic tattoos that are displayed to portray a certain philosophy, tattoos that provide a criminal history of talents and personal accomplishments, as well as tattoos that are exclusive to certain groups. It will cover every group that uses common symbols and tattoos to display membership. Lastly it will examine hidden and coded tattoos that are not usually recognized outside the criminal circles.