Liberal Leader Justin Trudeau says marijuana storefronts, like the one selling medical pot on Main Street in Winnipeg, should be allowed to operate.

At a Liberal campaign office just blocks away from the controversial shop, Trudeau reiterated his pledge to legalize marijuana if elected.

He says by licensing and restricting the sale, it keeps the drugs out of the hands of kids and criminals.

"We have to create an entire system that controls and regulates marijuana that will include medical marijuana and properly licensed dispensaries. How we go about doing that will be deeply informed by the lessons learned by the United States and other places so we build the right model for Canada," said Trudeau.

Winnipeg Police have warned they might shut down Your Medical Cannabis Headquarters, a business that's been operating since July 1.