It is not necessary that a person show signs of impairment to found a basis for making a roadside breath demand. Nor is it necessary that a police officer suspect the person is committing a crime. All that is required is that the police officer making the demand has reasonable grounds to suspect that a person has alcohol in their body.
See s. 254(2) of the Criminal Code;R. v. Schouten, 2016 ONCA 872 at para 26.
Reasonable suspicion must be assessed against the totality of the, circumstances.
R. v. Chehil, 2013 SCC 49,