"I would not be crossing the border until I am safely out of that company", he said.
An admission of any past drug use is grounds for a lifetime ban from the US, although some banned people can successfully apply for waivers.
"We don't recognise that as a legal business", Mr Owen said.
Owen said that travelers are typically allowed the opportunity for a "voluntary withdraw" from a border crossing but noted records are kept whether a traveler enters the USA or not and such a traveler will not be able to return to the U.S.
The rub is that it's illegal to have smoked the drug in Canada before October 17, and it's illegal to lie to any border agent who asks about it.
Jordan Sinclair, with Canopy Growth, a major medical marijuana supplier in Canada, told the BBC that while their employees have yet to face difficulties at the US-Canada border, the industry as a whole is seeking more clarity as to how cases will be consistently handled by border officials. Politico says CBP did not specify any minimum level of investment that could trigger a ban. The advice of Goodale and Trudeau is to be honest at the border - and to make sure you're not carrying.
"Despite one-in-eight Canadians using cannabis today, 400,000 people move between our two countries every day nearly entirely without incident", Canada's public safety office told Bloomberg.
The government is also ramping up advertising reminding Canadians of their obligations to obey the laws of both countries.
Overzealous border agents could encourage even more Canadians to stay home, at a time when President Donald Trump is targeting the country in trade negotiations.
Grant McLeod, a senior vice-president of regulatory affairs at Beleave Kannibis, has been in the USA several times since entering the cannabis industry. "This could add to that". The figure was $27.2 billion in 2014, when the country's currency was close to par with the greenback.
It could create problems for workers or executives if border officials ask them straightforward questions about their occupations.
In an extensive interview with Politico, Todd Owen, the executive assistant commissioner for the Customs and Border Protection's (CBP) Office of Field Operations, 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".
"I think it's incredibly risky for someone to [lie], especially if they are somebody who works in the industry and their affiliation with the industry is readily available online", said Enenajor.