"I would not be crossing the border until I am safely out of that company", he said.
Oh yeah, and if you're asked about past drug use, Owen stated that travellers shouldn't lie.
There have been concerns within Canada's growing cannabis industry for months that they may face trouble crossing the border. Politico says CBP did not specify any minimum level of investment that could trigger a ban.
Immigration lawyers have said they have heard similar stories from clients in the industry.
According to the Politico article, USA border officials allow people admitting to past illegal drug use a chance to "voluntary withdraw" from the border or face what's called "expedited removal".
Companies hiring new employees should ask prospective hires if they have any current or past connection to the marijuana industry that could put them in the crosshairs of US border officials, he said.
"Our officers are not going to be asking everyone whether they have used marijuana, but if other questions lead there - or if there is a smell coming from the vehicle, they might ask", the official said.
He also said that investors in the industry could also face a ban. "We don't recognize that as a legal business".
An admission of any past drug use is grounds for a lifetime ban from the USA, although some banned people can successfully apply for waivers.
"Despite one-in-eight Canadians using cannabis today, 400,000 people move between our two countries every day nearly entirely without incident", Goodale spokesman Scott Bardsley said by email. Under the policy, United States officials are to bar entry to Canadians who acknowledge having consumed marijuana at any time in their past, as well as those who are either employed or invested in legal cannabis enterprises.
Thousands of Canadians have invested in the cannabis companies, which are publicly traded on the Toronto Stock Exchange. Marie, Mich., to grab a cheap tank of gas or case of beer anytime soon, as people who work in the marijuana industry - or invest in it - could risk a lifetime travel ban.
As Canada's new law to legalize and regulate marijuana is set to go into effect on October 17, Canadian officials are warning citizens to remain cautious when they visit the United States.
Eight US states - Colorado, Washington, Oregon, Alaska, Maine, Massachusetts, Nevada and California - have now legalised recreational and medicinal marijuana. Medical marijuana has been legal since 2001. But the drug remains a Schedule 1 controlled substance - alongside LSD, heroin, and ecstasy - under U.S. federal law.