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A more practical example was the court case that allowed female soldiers to serve with weapons in Germany.

It went all the way up to European level, and there they overturned German law.

EU is not a great example, since there are no EU laws per se, it's countries that have to implement EU directives. additionally there is no EU jails or criminal justice system.

There are EU laws per se.

http://en.wikipedia.org/wiki/Regulation_(European_Union)

I didn't want to use the European union in my example because it get's even more complicated with it. (e.g. directives that have to be implemented as laws by its members)

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