To answer your question, I would say that we talked about California being a major player. Even California, though, is looking to Mexico right now. That means we're going to see more and more Mexican strawberries coming into Canada. The conditions of the workers growing those strawberries are not questionable, but they aren't necessarily in line with the working conditions in Canada.
How can the government help? It could introduce measures to create a level playing field for Canadian strawberry growers. Again, if we look at the private sector, it is possible to visit suppliers on the ground or see how the food is produced in plants. Inspections need to be done, but not just at the border. It's also important to go to suppliers' sites.
Should it fall to the government or retailers? The important thing is making sure that suppliers adhere to certain requirements, not necessarily environmental requirements, but social ones. If a supplier will not commit to adhering to all the requirements or fails to adhere to them, unfortunately for them, their products shouldn't be allowed into Canada.