HALIFAX -- Two former employees of the Canadian Coast Guard and the Department of National Defence are facing charges in Halifax following a drug investigation with ties to Colombian and Mexican drug cartels.

The RCMP allege the pair used their positions to gain access to information for criminal intent.

The Mounties' investigation, which started in the spring of 2013, uncovered evidence of conspiracies to import cocaine from Antigua, Brazil, Colombia, Guyana and the United States.

In April 2015, 15 people were charged.

Additional charges were laid Tuesday against two of those accused, both of them from Nova Scotia.

Delbert William Meister of Halifax, a former employee of the Canadian Coast Guard, and Darlene Margaret Richards of Greenwood, N.S., who once worked with the Defence Department, have each been charged with breach of trust and possession of proceeds of crime.