Changes to Canada's drunk driving laws will give police sweeping powers, warn legal experts

If Canada's new impaired driving laws are passed police could show up on your doorstep up to two hours after you arrive home to demand a breath or saliva sample.

It's one of the things that most concerns Calgary defence lawyer Dale Fedorchuk. whosays the proposed law "begs" for a constitutional challenge.

Fedorchuk saysofficers would have the power to charge someone with impaired driving, even after they park their vehicle.

"I don't understand the reasoning," said Fedorchuk. "Why do we have to be concerned about people who are already home?"

The Trudeau government introduced sweeping changes last month that include, among other measures, mandatory roadside breath samples and much harsher penalties for some offences that could result in up to 10 years in prison.

Police can also demand a roadside saliva sample but they must first have reasonable suspicion that a driver has drugs in their body.

• Trudeau government introduces sweeping changes to impaired driving laws

The changes, which were announced the same day the federal government unveiled its bill to legalize marijuana,are stirring a lot of debate among local lawyers, legal experts and victims groups who are lining up to either praise or pan the legislation.

"I'm a little puzzled, actually," said Calgary law professor Lisa Silver.

Along with Fedorchuk, Silver also predicts the law will be challenged on constitutional grounds because police will no longer require "reasonable suspicion"before demanding a breath sample.

Officers can simply demand a test and drivers will have no choice, since refusing to provide a sample is a Criminal Code offence.

"There's going to be litigation around this for sure," says Silver.

Section eight of the Canadian Charter of Rights and Freedoms states "everyone has the right to be secure against unreasonable search or seizure."

Silver says once a sample is unreasonablyseized, a driver would essentially be "conscripted against themselves."

"What you've given those officers will be used against you to convict you, ultimately, in court," said Silver.

Shifting the burden of proof

Fedorchuk says the proposed law could shift theburden of proofonto an accused. As an example, he says someone who is approached by police at their residence would have to prove they consumed alcohol or drugs at home after they exited their vehicleand were not driving drunk.

Silver says the changes are likely meant to eliminate what's known as the bolus or intervening drinking defences.

Currently, drivers can avoid fines or a criminal conviction by claiming they consumed alcohol just before or while driving, and thus were not over the legal limit at the time they were driving because the alcohol was not yet fully absorbed in their system.

They can claim it was only later, at the time of testing, that they reached an illegal blood-alcohol concentration.

Additionally, they can attempt to dash away from the scene of an accidentand claim they consumed alcohol once home.

The government says it would close that loophole by changing the timeframe for blowing over the legal limit from "at the time of driving" to within two hours of driving.

It's a big problem

Silver says the issue may run contrary to the presumption of innocence.

Calgary police officers who conducted a recent checkstopon Mission Road in southwest Calgary appear supportive of the new changesparticularly the section that drops the requirement that officers must first have reasonable suspicion before demanding a breathtest.

"To keep everybodysafe it's a good idea they should also be checked randomly for any alcohol consumption or drugs," said Acting Sgt. Mudassir Rana."So checkingtheirsobriety should be a basic part, a condition of their license."

Calgary ranks20thamong Canadian metropolitan areas in the number of impaired driving charges laid according to areportfrom Statistics Canada.

Good first step

Mothers Against Drunk Driving says the proposed changes are a good first step. Karen Harrison says there's a link between tougher impaired driving laws and reduced fatalities and injuries in other jurisdictions.

Her brother, Tony Harrison, was killed by a repeat drunk driver in 2012 who was then sentenced to six years in prison.

Harrison isn't sure the new tougher laws still stop chronic, repeat offenders.

"It will deter some people from drinking and driving," she said.

• Bryan Labby is an investigative reporter with CBC Calgary. If you have a good story idea or tip, you can reach him at bryan.labby@cbc.ca or on Twitter at @CBCBryan.