Canadians who use marijuana, work in and invest in the marijuana industry risk a lifetime ban on travel to the United States, a USA official said this week.
"Canadians are going to let their guard down and think what's the problem?" said Todd Owen, executive assistant commissioner for the Office of Field Operations.
In the meantime, workers in Canada's cannabis sector should stay away from the US border until they find a new job, said Levitt.
Should a traveller admit to past use, he will be found to be "inadmissible" to the U.S.
"If you are thinking about investing in a marijuana-related company, you should beware of the risks of investment fraud and market manipulation", the SEC said.
Thousands of Canadians have invested in the cannabis companies, which are publicly traded on the Toronto Stock Exchange.
The federally illegal standing of cannabis in the USA means that those who work or invest in the cannabis sector in Canada could be treated as though they are a drug dealer or working for some sort of cartel, despite the market being legal for many years at this point.
Despite that Canada will have legal cannabis nationwide in a month, and that a majority of states have legalized cannabis to some extent, the plant remains illegal at the federal level. "They have legalized marijuana in a number of their states and we're trying to make sure that travel between our two countries is not disrupted", Trudeau told CBC Manitoba. He noted that investors from countries like Israel have been denied entry into the U.S.
"It's going to be a real issue for employers and a much bigger issue for employees, who - if I were them - would be panic-stricken right now", said Levitt.
Another official said those participating in the marijuana business may be turned away at the border.
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.
"It's going to happen even more, and especially now that they're going after business travelers, it's going to be the Wild West at the border". "But if an agent asks the question, I suppose they could decline to answer", Lorne Waldman, an immigration lawyer, tells Bloomberg.
Cars from Canada line up to cross into the U.S.at Blaine, Wash.
In the US, recreational marijuana is legal in nine states and Washington, D.C., while medical marijuana is legal in more than two dozen states.