The central premise of my story is that one day in the year 2017, an unknown entity starts imbuing humans with supernatural abilities. A quick rundown of the system:
Every human over the age of 13 has a brand on their right arm with six circles on it. When a human reaches the age of 13, the brand will appear on their arm the next Saturday at 12:00 PM EST.
Every Saturday at 12:00 PM EST, a rune appears on one of the free circles on the brand of every 13+ human, representing a new power. It is the same rune for everyone on Earth that week.
When all 6 circles are filled with runes, the one in the last circle (the "deletion slot") will be replaced with the next rune when it arrives next Saturday.
The position of these runes can be shifted around telepathically, so you, and only you, can decide which runes you will keep and which one you will discard when the next rune comes.
Destroying the brand will not take away your powers. It is merely a visual representation of them. In addition, if the right arm is cut off, the brand will appear on the left arm, and if both are gone, it will appear on the chest.
Now pretty early on concerns are raised about the potential dangers of letting citizens run around with superhuman powers, and many people start arguing that we should take advantage of the "deletion slot" to criminalize possession of certain powers and require that citizens delete them at the end of the week. A fierce debate ensues about the merits and dangers of this concept, and in America the anti-rune-control side wins out due to there being a (fictional) Republican president and a Republican-controlled congress, and the Republicans generally maintain that this violates the spirit of the second amendment and would cripple the recruitment base of the army in dangerous and unpredictable ways (the narrative purpose of this, obviously, is that the more powers my characters are allowed to have, the more interesting the story is).
But it's pretty clear to me that many other parts of the world, namely Europe, would have a different take on this issue, and would probably criminalize any powers that would seriously aid in crime. But here's the problem: assuming they can set up a system by which to quickly make judgements on the legality or illegality of each new rune within the span of a week, enforcing these laws would basically be like making sure every citizen in the country who isn't a part of the military or law enforcement is properly disposing of the gun that magically appears in their laps on a weekly basis. That sounds like enforcement would run a very high risk of being (or at least appearing) invasive and authoritarian.
If a country wanted to keep crime-aiding powers out of the hands of the people but wanted to do it in as unobtrusive of a way as possible with the fewest violations of civil liberties, how could they do it?