Statistics Canada has released its annual Juristat Article on Impaired Driving in Canada.  It is a useful reference to find out, among other things, what provinces have the highest impaired driving rates and what time of day has the highest number of police-reported impaired driving incidents. Knowledge of such information can be useful in investigating possible impaired drivers and also can be useful in adding to an officer's level of training regarding impaired driving investigations.  Impaired Driving in Canada, 2011