"Drugged Driving" Charges Laid in Toronto

According to an article published just minutes ago on CP24, Toronto Police have laid the first ever charges for "drugged driving" under new laws that were brought into place in July.

It's not certain at this point what drug was found to be causing impairment, but police Sgt. Tim Burrows has told reporters that some tests have been sent off to lab for analysis.

The article states:
"They arrested her for impaired by drug and introduced her to a drug recognition expert," he says, adding the expert conducted a series of tests, including some that will be analyzed at a lab. "He determined that a drug charge should be laid."

I'm all for taking people who are wasted high off the roads, and enforcing such a policy, but I can't help but feel that all of this seems very grey. Is enforcement even possible? Do we even know, for example, what level of a given drug intake results in impairment? What about prescription drugs? Surely some people are less affected and others more affected by a variety of drugs.

It's also uncertain how this new law might also affect the estimated half million Canadians that toke and drive in a given year.

Furthermore, what if lab tests end up coming back negative?

One thing is for sure... the face of policing is changing in Canada.