Here are some General Rules on "Impaired Driving"

If the Police ask you to take a breath alcohol test and you fail or if you refuse to do it, you may get a 24 hour suspension on the spot, and they may issue a further 90 day driving prohibition.

Don’t even think about driving while you are temporarily suspended or prohibited in this 24 hour period, because the vehicle you are driving can be impounded and the whole process can be expensive in the end

You can expect charges under the Criminal Code if:

A police officer has reasonable and probable grounds to believe that your ability to drive is impaired by drugs or alcohol.

You are driving with a blood alcohol content over .08%.

You refuse a test for alcohol. 

If you are convicted of driving while impaired, driving with a blood alcohol level of over .08%, or for refusing a test for alcohol, you will lose your license for 1 - 3 years, you will get a fine of anywhere from $300 to $2,000, and/or get jail time of 0-6 months. You will also get driver points issued against your license which will cost you more at insurance renewal time, and you will get a Criminal Record.

In cases of second offences, you will go to jail for at least 14 days and maybe more, and the third offence, you will get no less that 90 days in the slammer. 

If you are convicted of impaired driving and you cause injury or loss of life you could be charged with an indictable offence under the criminal code and end up with 5 years in the “bighouse”and lose your license for life.