Hello guys-16 even with parents concent-most shops will only do a cover up. You have to check your state laws on that. And just because your mom says it's ok dosen't mean an artist will do it-it's at their discression-I know most good artists, and shop owners will not do tats on anyone below the age of 18-even with parents concent-and no a "permission slip" will not do. Cover ups only here in TN and in NY state, under the age of 18. And it's not true you have to wait 4 years to give blood-you can give blood anytime with tats-as long as there is no infection-I know, I have 12 of them and it never prevented me from giving blood. I know you want a tat but seriously think about it-16 is really young and you may regret it later-atleast wait until your out of school and of proper age. But if you are hell bent on getting one, and you can-DO NOT go to someone who isn't certified, alot of shops have people who aren't certified, they are just training-and they won't tell you either-ask! Make sure the person who is doing it uses disposable needles, tubes, ink cups and who has a clean place-you may get more than just a tat! Some shops will reuse tubes & ink cups thinking it's ok-it's not-disease can spred through the reuse of tubes and cups-not just needles. Also Keep in mind of what you want before you go there-it can be overwhelming when you see all the flash they have covering the walls-and you might make a rash choice, I had a stick on for a week-of what I wanted-and where, have never regretted getting it. Just be safe...and good luck, I hope this helps.