That doesn't mean they will always get it right, but it's often screwed up more by the legislators than the attorneys.
Laws that are so vague that they don't give notice to someone of what conduct is proscribed are not valid in the US.
Additionally, in the US, laws found to be unconstitutional are void ab initio.
They are not struck down. They are declared never to have been valid in the first place.
(Though, like anything, perfect consistency is not a goal of the legal system, so you will see this screwed up at times as well)
That doesn't mean they will always get it right, but it's often screwed up more by the legislators than the attorneys.
Laws that are so vague that they don't give notice to someone of what conduct is proscribed are not valid in the US.
Additionally, in the US, laws found to be unconstitutional are void ab initio. They are not struck down. They are declared never to have been valid in the first place.
(Though, like anything, perfect consistency is not a goal of the legal system, so you will see this screwed up at times as well)