On 23rd June 2012, in Arizona, et al. v. United States, the United States Supreme Court struck down many of the key provisions of the controversial Arizona statute SB1070. Arizona law made it a criminal misdemeanour for a non-US citizen to omit to complete an alien registration document and carry it with him or her at all times. The Supreme Court found that this should not be criminalised because federal law does not impose this requirement on anyone, yet the law was pre-empted by federal law. The Supreme Court also struck down a law that criminalised ‘an unauthorised alien to knowingly apply for work, solicit work in a public place, or perform work as an employee or independent contractor’. However, the Court failed to invalidate a very controversial provision allowing local law enforcement officials to question individuals about their immigration status when apprehending them.