What do their tattoos look like? Is there a web site. I saw a guy near my neighborhood with a very strange large tattoo on his back. He was kind of scary looking, even without the tattoo.
If you google "M13 tattoos" you should be able to find some good photos. Generally they have crazy tattoos on their faces--that's the M13 giveaway. Also, prominent tattoos of "13" are a big giveaway as well.
There was a shocking broad daylight rape of an 11 year old girl in San Diego yesterday. She was dragged behind bushes near a sidewalk and attacked. The young HIspanic perp had "tear drop" tattoos near his eyes. Even the PC media is mentioning the gang/prison significance of these "tear" tattoos. They said it means "Mi Vida Loca" or something, in gang code. Whatever "My Crazy Life" means to Hispanic gang bangers.