The gateway to the detention rules. Whenever the question is whether somebody should be held, three things are being assessed: whether they are unlikely to show up, whether they are a danger to the public, and whether their identity has been established. The lists that follow (245 and 246) set out what an officer actually weighs on the first two.
244 For the purposes of Division 6 of Part 1 of the Act, the factors set out in this Part shall be taken into consideration when assessing whether a person (a)is unlikely to appear for examination, an admissibility hearing, removal from Canada, or at a proceeding that could lead to the making of a removal order by the Minister under subsection 44(2) of the Act; (b)is a danger to the public; or (c)is a foreign national whose identity has not been established.