This is an operational matter for the RCMP, and the RCMP would have to decide whether it has the resources or would need the assistance of outside organizations.
At first glance you might ask why an organization containing many thousands of trained investigators would need outside assistance. It is because of the different nature of a harassment investigation. Generally, police officers are trained to gather evidence to support a criminal prosecution. With respect to harassment investigations, the goal is to gather evidence, yes, but with the goal of solving problems if possible, and if necessary moving on to a formal complaint mechanism.