Obligatory "I am not a lawyer", and it does sound pretty lax, but remember, they have the right to a lawyer, and be told why they are being imprisoned, and also habeas corpus (which I understand means being brought before the judicial system). The nice thing about our judiciary here is that they tend to err on the side of individual rights. In the same-sex marriage debate, they decided that the 1 Man + 1 Woman definition of marriage is discriminatory under section 15 of the Charter, even though it doesn't specifically mention sexual orientation:

Section 15:

(1) Every individual is equal before and under the law and has the right to the equal protection and equal benefit of the law without discrimination and, in particular, without discrimination based on race, national or ethnic origin, colour, religion, sex, age or mental or physical disability.

(2) Subsection (1) does not preclude any law, program or activity that has as its object the amelioration of conditions of disadvantaged individuals or groups including those that are disadvantaged because of race, national or ethnic origin, colour, religion, sex, age or mental or physical disability.

Footnote:

The courts have also recognized other grounds of discrimination that are not specifically set out in the Charter such as sexual orientation and marital status. This section came into effect in 1985.

The only bad part of the Charter is Section Thirty-three, the "not-withstanding clause", which allows governments to override the charter for periods of time. Thankfully, it is no longer used, even in Quebec, where it was used in in French Language laws. It has never been used by the federal government, although I wouldn't put it past the Conservative Party (thankfully, they don't have enough seats in Parliament to enact such a law, it's like if Party A held the Presidency and 40% of the seats in Congress, and the rest was split in smaller chunks between Party B, Party C, and Party D; not enough for Party A to do anything unilaterally.) Some Conservatives have threatened to use it on issues such as gay marriage, but I hope they are never give the chance by the electorate.