Arizona goes it alone with tough immigration laws | World news | The Guardian

Under the new laws, anyone the police suspects of being in the country illegally can be asked to produce an alien registration document, such as a green card, that allows non-citizens a right to work, and could face a $500 (£320) fine if they fail to produce one.
This will be accompanied by a crackdown on employers who take on day labourers, who often stand at specific street corners in the hope of being offered work. The new legislation makes it a crime to pick up someone if the driver "knows or recklessly disregards the fact that the alien is here illegally".
Newman said that part of the legislation was the most obviously unconstitutional, denying a person freedom to seek work.