Environment committee  I had a comment on the use of risk assessment for mixtures or groups of similar substances. I think cumulative exposure is an approach you can take on things like the organophosphate pesticides that have a similar mechanism of action. I think, again going back to my arguments,

Environment committee  Good afternoon. I'm Dr. Roger Keefe of Imperial Oil. I was asked to speak to you on today's topic by the Canadian Chemical Producers Association. I also work closely with the industry coordinating group for CEPA; they have also previously appeared before you. My views are techni