We do set maximum residue levels for each pesticide. There is a maximum residue level set for each pesticide and each type of crop grown in Canada, and it is essentially the standard that we set. That is enforced by the Canadian Food Inspection Agency. Produce coming in from another country has to meet our standards. Similarly, produce going from Canada into the United States has to meet their standards. There is a very specific standard required before it can move across the border. Within Canada, you can only use a specific pesticide on a specific crop or product such as carrots if it has that specific approval from us on the label of the product.
On January 27th, 2015. See this statement in context.