The Government Accountability Office, an investigative branch of the U.S. Congress, sent out investigators to test how hard it would be to transfer large red duffel bags at unguarded and unmonitored spots along the 8,000-kilometre border.
The tests were done from four northern states, which were not identified. The exercises were videotaped and photographed.
The details of the investigation were outlined in a 13-page report that will be given to Congress.
During one of the tests, a citizen noticed the unusual activity and alerted a border official, but by the time authorities came to the scene, they could not locate the undercover investigators.
"Our work shows that a determined cross-border violator would likely be able to bring radioactive materials or other contraband undetected into the United States by crossing the U.S.-Canada border at any of the locations we investigated," the accountability office report states.
Investigators determined that the Canadian border with the United States "presents more of a challenge" than the U.S.-Mexico border.
Is this a Canadian problem or an American issue?