My 16 year old son got a tattoo without my permission, and we live in Ca where it is illegal, what can I do?

Im so mad my 16 year son came home with a tattoo without my permission, its his deceased fathers name on his arm, he knew I never wanted him to get one, but he got one anyway, I dont know who did it, but Im sure one of his friends know, In Ca its a mes meaner to do that to a minor. I wanted to go down and file a police report, my mother said it probably wont do any good, but I wanted to do it anyway, plus she said the police might take my son to juvenile hall, I dont know if thats true or not, but I feel like he really disrespected me by getting this done, and I want to take him somewhere to get it removed.. What do you think I should do?