The database, called Tuscan, is provided to every Canadian border guard and immigration officer, and empowers them to detain, interrogate, arrest and deny entry to anyone found on it. Hundreds of pages of documents obtained by the Guardian through Canada’s access to information system reveal the fullest picture yet of a database that, although employed in Canada, is maintained exclusively by the US. It contains the personal information of as many as 680,000 people believed by US authorities to be linked with terrorism, and functions effectively as a second no-fly list that is cloaked in secrecy. *** Tuscan – which...