1. No individual may be arrested, detained, or prosecuted for an action which is not illegal according to a member nation's established statutory laws, judicial precedents, and/or principles or guidelines with the equivalent force of law;
Shouldn't that be more specifically "the relevant member nation's"? Otherwise you're arguably leaving repressive governments with the loophole that they could (and, bearing in mind what some of the other members are like, in some cases probably would...) arrest people for acts that were legal in their own country but were illegal in some other member nation instead...