This is something that Democrats and Republicans in the Senate worked together to write and pass.

WHITEHOUSE: Press Briefing

You have to work back from there -- and this is a little bit of an imprecise science -- but you have to work back from there to allow for what it would take to write and pass legislation that would take care of this issue.

WHITEHOUSE: Press Briefing

Even at this point, each member state has to write regulations or pass laws implementing the decision.

ECONOMIST: Food fights