If the proposal in Bill C-226 was accepted, the answer would be yes. Any police officer in their patrol vehicle could administer the test to identify the presence of alcohol on the road. In major cities, a dozen police officers may stop traffic and select five or six individuals to test. In a rural setting, the police force may consist of four or five officers. So it would be a bit difficult to do the same.
On September 27th, 2016. See this statement in context.