Mr. Robert Wright (Director General, Major Crown Projects, Department of Public Works and Government Services) at the Government Operations and Estimates Committee

For all the contractors, in fact all the individuals, involved in the projects on Parliament Hill, the Commons security clearance process that is used is called the site access security clearance. It involves three elements. There's a background check; there is a criminal name check conducted by the RCMP; and there is a loyalty assessment conducted by CSIS. Every employee, contractor or otherwise, who worked on the project received a security clearance.