The Canadian Charter of Rights and Freedoms guarantees everyone in Canada the right to freedom of expression and the right to peaceful assembly. It also guarantees the right of all persons to be free from arbitrary detention and unreasonable search and seizure. These constitutional liberties - and the limits they place on government and police - are the foundations of our free and democratic society. The G20 Summit did not authorize or warrant their suspension. Constitutional guarantees matter because, as is often said, without them, "even the most democratic society could all too easily fall prey to the abuses and excesses of a police state."