3 (Disclosure of information) This part gives new powers to Her Majesty's Customs and Excise and Inland Revenue (now merged into His Majesty's Revenue and Customs) to permit them to disclose information "for law enforcement purposes". It also clarifies the existing requirements to disclose information for criminal investigations, particularly in relation to confidential information held by public bodies. Part 4 (Immigration and asylum) Part 4 allowed for the Home Secretary to certify any non-British citizen whom he suspected to be a terrorist and detain them indefinitely, pending deportation, even when such a deportation would be prohibited. The Law Lords ruled against the law in a case brought by nine of the detained suspected terrorists on 16 December 2004 (by issuing against it a declaration of incompatibility with the European Convention on Human Rights, as provided in the Human Rights Act 1998). The measure was effectively abolished the following March when it was up for review. Its powers were replaced with "control orders", brought in by the Prevention of Terrorism Act 2005. Implementation The Immigration Act 1971 allows for the deportation of those who are a threat to national security for cases where there is insufficient admissible evidence for prosecution; however, a ruling by the European Court of Human Rights in the case of Chahal v United Kingdom in 1996 ruled that deportation of persons to another country was not allowed if there were substantial grounds for believing that the person would be subjected to torture. As a result, the government argued that this provision was necessary to overcome this conjunction of legal and security problems, and allow indefinite detention without charge or trial. Since this measure was known to step beyond the bounds of Article 5 of the ECHR, the government included section 30 to allow for a derogation (an opt out), claiming that since there was a "state of emergency threatening the life of the nation" (just one interpretation of the War on Terror) which allowed it to do this. The Special Immigration Appeals Commission was to oversee the process. The derogation order came into force on 13 November 2001, and was repealed on 8 April 2005. Between those dates the government claimed that there existed in the United Kingdom a state of public emergency threatening the life of the nation, within the meaning of Article 15(1) of the ECHR. This part was renewed by Parliament on 3 March