It's been a little over a month since pot became legal in Canada, but Waterloo Regional Police Chief Bryan Larkin says not much has changed in the day-to-day realities of policing.

In April, a report estimated training and enforcement of new cannabis laws could cost the WRPS more than $3 million.

There was also concern across the country that police may not be adequately prepared to detect high drivers.

Larkin told CBC News officers are continuing to receive training on cannabis legislation and drug detection.

"Obviously we've been heavily focused on road safety, so we've had a significant program around impaired driving and those types of processes," he said.

"But again, we haven't seen a significant change. It's really been business as usual."

There have been a few cases of drivers being charged after police found they had open access to cannabis, Larkin said.

He added that the full impact of legalization may not be realized until there are licensed retail stores in the province.

"You have to go online to order. And I think, you know, obviously a lot of people in Ontario are doing that, but the reality is, is that the contraband market, the underground market, the grey market still continues to go."

Larkin said police are encouraging the public to be careful about where they buy their pot while waiting for retail stores to open in Ontario this spring.