It was reported earlier this summer that admitting to smoking marijuana now or in the past can also result in a lifetime ban. He said he has disclosed his employment each time crossing the border, and has never been turned away.
Owen says if a traveller is asked about past use use, he shouldn't lie.
There have been concerns within Canada's growing cannabis industry for months that they may face trouble crossing the border.
CBP has not specified a minimum investment threshold in marijuana businesses that would trigger the lifetime ban.
Immigration lawyers have said they have heard similar stories from clients in the industry.
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 USA border officials, he said.
Not every traveller will be asked whether they use marijuana, but Owen also outlined several signs of pot use that officials will not ignore.
"We don't recognise that as a legal business", Mr Owen said.
Canadians about to enjoy newly legal marijuana - and even investors in the sector - could face new headaches at the US border.
People who have received bans still have the possibility of applying for a waiver from US Customs and Border Protection (CBP).
"Working or having involvement in the legal marijuana industry in U.S. states where it is deemed legal or Canada may affect an individual's admissibility to the U.S.", a spokesman for U.S. Customs and Border Protection told Bloomberg News.
Prime Minister Justin Trudeau's government officials have maintained that despite the change in law, there is no indication marijuana legalisation will shift the United States approach in how it deals with Canadians crossing the boundary, and confirmed that involvement in the industry could result in denied entry.
"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.
On Thursday, a senior USA border official told the American online publication Politico that Canadians who invest in cannabis companies or work in the industry could be turned away at the border, even after recreational marijuana becomes legal in Canada next month.