2 questions about Muay Thai boxing - learning and teaching .....

[Gizmonster]

Firstly, if you want to learn the sport of Thai boxing, do you need some kind of licence and will you get a police check to see if you've some kind of violent past, etc ?? I would have thought, that seeing how it's a lethal sport, some kind of check would be inevitable, as this "power" in the wrong hands could be disastrous.

Secondly, if you want to teach Thai boxing, do you need to be registered with a governing body ?? I would assume that this would be the case and I'm also assuming that there could be more than 1 governing body covering Thai boxing krus (teachers).
Does anyone know what the governing bodies are and how I check to see if a certain person is "fit" to teach Thai boxing ??

TIA :)