This is interesting. It is like an oppositional amicus curiae. If you don't agree with a law, you will file suit as an advocate of the law to test the validity

This is interesting. It is like an oppositional amicus curiae. If you don't agree with a law, you will file suit as an advocate of the law to test the validity of the law. Does the US legal system allow this? I know it is easy to file a suit, but will it stay in the court system?