Pardons are supposed to let a former offender move on. So why do they sometimes create more problems than they solve at the U.S. border?

Mark pleaded guilty to marijuana possession in 1982 at age 18. Thirty-seven years later, U.S. border officials confronted him about the arrest, banning him from the U.S. for life.

New Brunswickers are less than half as likely to use credit cards to buy cannabis compared to alcohol. Why? Uneasiness about the U.S. border, one expert says.

Canadians may be banned from entering the U.S. for legally using marijuana in Canada if a border officer decides that they are likely to consume it in the United States.

Will the U.S. ban Canadians for life for legal marijuana use in Canada? "It would be good to know," one U.S. immigration lawyer says.

In a policy change made without fanfare Tuesday, U.S. Customs and Border Protection (CBP) now says Canadians who work in the legal cannabis industry here will be free to enter the United States. 

In some provinces, marijuana sales will be online only to start. But that raises an awkward question — what will happen to all that credit card data south of the border?

Liberal MP Bill Blair's advice to "always tell the truth" if asked about past marijuana use by U.S. border officials is "dangerous," a U.S. immigration lawyer says. 

A charge from a legal Canadian cannabis store on your credit card data would give American border guards a way of banning you from the U.S. for the rest of your life, experts say.

When U.S. immigration officials found out that an Israeli scientist worked in Nevada's legal medical marijuana industry, he found himself escorted to a plane in handcuffs.