The agency responsible for airport screening says its staff made a mistake when they confiscated an explosive device from a passenger's bag but let the young man get on a plane rather than calling police.
Mathieu Larocque, spokesman for the Canadian Air Transport Security Authority, said staff in Edmonton should have contacted police right away, not four days later.
He said a review was conducted after the incident last fall and some screening employees were suspended.
"There were people disciplined and they were required to take extra training," Larocque said Wednesday. "The procedure is to call the police and it didn't happen or it happened very late in the process."
Skylar Murphy, 19, of Spruce Grove, Alta., pleaded guilty last month to possession of an explosive substance while at the Edmonton International Airport on Sept. 20.
He was sentenced to a year of probation and fined $100.
Court documents describe the material seized from his carry-on luggage as "black powder" and some reports say it was a 15-centimetre pipe bomb with a fuse wrapped around it.
CBC and The Edmonton Journal quoted sources as saying a screening officer tried to return the device to Murphy when it was found, but the teen didn't want it back.
The media outlets reported Murphy made the device while fooling around with friends and mistakenly left it in a bag he was taking on a trip to Mexico with his family.
RCMP spokeswoman Josée Valiquette said officials with the security authority notified police on Sept. 24 about the seizure. Officers arrested Murphy on Sept. 27 at the airport, following his return flight home.
Larocque said it's procedure for screening staff to immediately call police if they find something suspicious. "Our screening officers are not police officers and they can't charge anybody with a crime."
Officers are stationed at major airports. It's up to them to decide if a passenger should be arrested or allowed on a plane, said Larocque.
He said training for screening staff across the country is being updated to emphasize the procedure.