The best practice is not to drink and drive.

Driving any motor vehicle while impaired by alcohol or drugs is illegal under the Criminal Code of Canada. Consequences are serious and can include fines, loss of your driver's and, or jail-time.

Police officers can demand that any lawfully-stopped driver provide a preliminary breath sample to test for alcohol without reasonable suspicion that the driver has alcohol in their body.

Mandatory alcohol screening can only be used if you, as the driver, are in care and control of the vehicle, have been lawfully stopped, and if the police officer has the approved screening device at hand.

Many individuals are impaired long before they reach a blood alcohol concentration of 80 mg. You can still be charged with impaired driving, and you may face serious provincial consequences, like losing your licence.

In Ontario, an impaired driving charge will stay on your driving record for three years. It will take ten years to remove the conviction from your criminal history.

Source: Government of Canada Community Safety, Policing and Engagement.

 

Impaired Driving

The Criminal Code prohibits driving while impaired to any degree by drugs, alcohol, or a combination of both. Penalties for this offence range from a mandatory minimum fine to life imprisonment, depending on the severity of the offence.

Alcohol and Cannabis

Combination of alcohol and cannabis The prohibited levels of alcohol and cannabis, when found in combination, is 50mg or more of alcohol per 100ml blood and 2.5 ng or more of THC per ml of blood.

Other Drugs

Having any detectable amount of LSD, psilocybin, psilocin ("magic mushrooms"), ketamine, PCP, cocaine, methamphetamine or 6-mam (a metabolite of heroin) in your system within two hours of driving is also prohibited. The prohibited level for GHB is 5mg or more per litre of blood, since the body can naturally produce low levels of this drug.