Victims of Psychopaths Community Group
Is he or she a sociopath or psychopath? Think we're only talking about serial killers here? Psychopaths, sociopaths and even narcissists come in every walk of life, every career level, and every socio-economic category.
Laws differ depending where you live, but I think you would start with reporting it to the health department or health inspector for the area you live in. I think they are the ones that look into stuff regarding tattoos and whether people are (or need to be) licensed, are using proper safety/cleanliness procedures etc.
You never know what madness these people are capable of...I would definitely try to report her to the Health Dept. or somebody. I heard on TV that tatoo chemicals wind up in a person's lymph nodes, so using the wrong thing can mess up the immune system.