Tattoos. Gadget blog. What’s the point? Science. Read on. Criminals often use tattoos as branding for their chosen gang. Tattoos and criminals can also be used as a “slate” or fleshy paper to send messages to other individual and gangs via tatooed on messages. Previously, criminals who were being targeted by law enforcement because evidence linked to a tattoo simply got a new tattoo covering up or modifying the old one so that the police had no way...