Two Canada Border Services Agency officers are among five people arrested by the Royal Canadian Mounted Police for breach of trust and drug importation offences.
The RCMP alleges that between January 2016 and April 2017 the border officers were importing cocaine through Toronto's Pearson International Airport.
A 32-year-old from Niagara Falls, Ont., a 41-year-old man and 57-year-old man, both from Brampton, Ont., have also been arrested in connection with the investigation.
According to RCMP, the Niagara Falls man and one of the Brampton men each faces two charges, which include conspiracy to import a controlled substance and importing a controlled substance.
The other Brampton man is facing one charge: conspiracy to import a controlled substance.
The 1½-year joint investigation between RCMP and the CBSA led to seizures of cocaine shipped from Colombia and Jamaica that were destined for Toronto.
The RCMP alleges this group was responsible for importing 30 kilograms of cocaine during that time.
The two border officers, a 37-year-old man from Toronto and a 41-year-old man from Barrie, Ont., each face three charges.
All of the accused were expected to have bail hearings at the Brampton courthouse on Thursday.