As of 2014, Knifethrowing is now legalized in Denmark and you can teach anyone down to 12 years of age.
For several years, EuroThrowers member Jean from the ChangHigh Circus in Denmark fought for his right to throw knives, and teach knife throwing in his circus. As a result of his lobbying, under certain conditions, teaching and throwing is now legal.
You should also get a one time teaching license from the ministry of Justice - a dispensation clarifying all legal matters, related to your work, your company or group of performers and artists, giving you the right to teach throwing to anyone from 12 years upwards. This dispensation is a kind of national security clearance, since now anyone can get permission to teach knife- and axe throwing. You may assume that the government doesn't give dispensation to people who previously in their life have had police or weapon issues.
Now, when you go out in public, like a market, festival, or flea marked, where you are booked to perform or earn money by teaching knife- and axe throwing, you still need to inform the local police in the area of your presence. And in case they show up to check you, you must have your 3 permissions (weapon, booth, police) and if the police finds anything further to say related to the booth or security or the like you must adjust yourself to such commands or they can cancel and close the booth.
To anyone trying to legalise knife throwing in their country, I would recommend:
Fight the tribulation, the trouble, the confusion with Light, Life & Love, using truth, wisdom and reason. Be prepared to be patient, avoid aggressiveness and use your cosmic consciousness with wit and intelligence.
The Jester Chango from ChangHigh Circus, Denmark