I don't have a number at my fingertips to give you, but you're absolutely right. When you bring in a replacement worker, are you doing your due diligence to make sure that the person has the qualifications to do the duties being requested? That may be the operation of heavy equipment, so you are not only putting yourself in danger; you're putting other people in danger.
I could talk about the Iqaluit housing authority strike that we had up in Iqaluit just this past winter. Our members were out, as I said, on the picket line for four months. The employer was bringing in replacement workers from down south. They were not checking credentials. They were going around to the housing units in Iqaluit doing plumbing work and electrical work. Were those replacement workers qualified to do that work? We don't know. We asked, but we were never given an answer.
Yes, any time you bring in a replacement worker, there is always risk of a health and safety issue.