the first is that congress, in developing a comprehensive scheme, set out a series of procedures with aljs of regulations. what arizona does is let 40,000 localities -- >> at the time the statute was passed, there were many laws that adjudicated revocation of licenses. perhaps not many have addressed the issue of hiring undocumented aliens but many state laws existed that independently adjudicate revocation. what is the history that shows congress intended to limit those adjudications? >> it is undoubtedly the case that without the parenthetical saving clause that arizona higle laws would be swept away. the questions is if the phrase stays that. the answer is no. to read the statute that way is to permit the states to have their own laws. it is the case that congress wanted to sweep away the state statutes that were in place that impose sanctions on employers. >> you are saying that if arizona sank you had to have a license to do business, and then became aware of a problem it did not know before, a lot of employers were imploring child labor and they did not know. they say, we can revoke