I can already make a tattoo that is visible on demand that runs no more risks than a standard tat: Putting it somewhere that's normally covered by clothing.

Sorry, but sweeps arm at timeline this is not gonna go well at all —not even if they try to spin as an "alt" lifestyle invention... and not the us v Them escalation it'll spark. 🥲

UV inks have been around for a while, they don't last very long sadly.