Good point. But my opinion is Amendments IX and X don't appear in their government copy of the Constitution.
It probably makes little difference. The Supreme Court ignored those amendments this week in the decision concerning medical pot. If you follow their reading of the Commerce Clause, nothing you do is outside the reach of the government.
I guess that the difference between that ruling and the recent one on medicinal pot is that intrastate possession of an item isn't interstate commerce, while on the other hand intrastate commerce is interstate commerce. Or at lease Scalia and Kennedy were convinced of that torturous logic.