Great little article with all the details you need to know about the RIDE program.
Telltale Signs: Toronto RIDE program officers have identified a number of behaviours that give away an impaired driver. Among them: weaving, gum-chewing, driving with open windows in cold weather, failing to turn on headlights, evasive responses to questions, leaning away from the window when questioned, and rolling down the rear window instead of the front when questioned by police.