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It is definitely not 'automatically presumed' that the detained person is lying. Rather, it will come down to credibility. To assist, you can present the case of Whalen
Whalen (Dec. 2, 1998), 40 W.C.B.(2d) 270 (Ont.Ct.(Gen.Div.))- an officer, when testifying, is not an officer of the state or the court, and an officer's evidence was not entitled to any higher credibility than that of any sworn evidence (i.e. police officers have no ‘extra credibility’)
By the sounds of it, there is certainly enough evidence to make a Charter s.8 application. Keep in mind though, that such an Application must be submitted well in advance of the trial.