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Saskatchewan has one of the highest rates of impaired driving incidents in Canada, with 539 per 100,000 population in 2019. The Traffic Safety Act and Criminal Code govern the rules and penalties for impaired driving, including the effects of prescription and over-the-counter drugs. Driving with a blood alcohol concentration (BAC) of .08 or higher is a criminal offence, and even a BAC of .04 can result in a fine and license suspension. The Code was amended in 2018 to include provisions for cannabis impairment, and mandatory alcohol screening (MAS) was introduced in December 2018, allowing police to demand a breath test without reasonable suspicion. Refusing to provide a breath sample results in a 24-hour license suspension and can be charged as a criminal offence.