A federal judge has upheld key portions of Alabama’s controversial immigration law, even those that have been blocked in other states. On Wednesday, Chief U.S. District Judge Sharon Lovelace Blackburn backed provisions that would require police to arrest anyone they suspect of being in the country without legal status, prevent courts from enforcing contracts involving undocumented immigrants, and allow public schools to determine the immigration status of enrolled students. Judge Blackburn blocked a small number of provisions, including one that would make it a crime to knowingly harbor or transport an undocumented immigrant. The law is widely acknowledged to be the harshest anti-immigration measure in the country.