Thank you, Mr. Chair.
That's an important question. On PCBs, what we've noted, as Mr. Vaughan has mentioned, is that during our work we talked to various organizations involved in the management of toxic substances and this issue came up. We were speaking to an expert, a researcher in Toronto who has been pursuing this, who also pointed out that research is taking place both in Europe and in the United States regarding this issue.
Recently, the Environmental Protection Agency in the United States has launched new research into the presence of PCBs in caulking in older buildings. They have issued guidance for schools. It's an old substance. It's an emerging issue with respect to an old substance. Again, it's an example of how we may feel that we've made a lot of progress in terms of some of these substances, and then science comes along and says there are still some issues that need to be addressed.
So just in summary, there are researchers in Europe and the United States, as well as Canada.