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n Canadian law, a security certificate is a mechanism by which the Government of Canada can detain and deport foreign nationals and all other non-citizens living in Canada. The federal government may issue a certificate naming a permanent resident or any other non-citizen suspected of violating human rights, of having membership within organized crime, or is perceived to be a threat to national security.Subjects of a certificate are inadmissible to Canada and are subject to a removal order.Where the government has reasonable grounds to believe that the individual named in the certificate is a danger to national security, to the safety of any person or is unlikely to participate in any court proceedings, the individual can be detained.The entire process is subject to a limited form of review by the Federal Court.
According to the Ministry of Public Safety and Emergency Preparedness, the overarching agency dealing with the law, the security certificate provision has existed in "one form or another for over 20 years." Its use has been documented at least as far back as 1979, the year after they were implemented.[6] It is housed within the parameters of the Immigration and Refugee Protection Act (formerly the Immigration and Refugee Act, which replaced the Immigration Act in 1976). It was amended and took on its present structure in 1991, with an additional amendment in 2002.
The security certificate process (sections 33 and 77 to 85 of IRPA) was found to be in violation of sections 7, 9 and 10 of the Canadian Charter of Rights and Freedoms and ruled unconstitutional by the Supreme Court of Canada in the landmark Charkaoui case on 23 February 2007. The Supreme Court suspended the effect of its ruling for one year. On 22 October 2007, the Conservative government introduced a bill to amend the security certificate process by introducing a "special advocate", lawyers who would be able to view the evidence against the accused. However, these lawyers would be selected by the Justice minister, would only have access to a "summary" of the evidence, and would not be allowed to share this information with the accused, for example in order to ask for clarifications or corrections.The amendments are modelled on a much-criticized process already in use in the United Kingdom. The bill amending Canada's security certificate regime, with support from the Conservatives and the opposition Liberal Party, was passed by Parliament and received Royal Assent in February 2008, just days before the court-imposed deadline.

http://en.wikipedia.org/wiki/Security_certificate