I think probably the best answer would be to provide standardized disposal techniques and processes. Unfortunately, this would have to be controlled at the college of pharmacists level in each province. Whether or not it's federally mandated—which would be great—it would actually be a part of the inspection process such that everything that has to come back has to be handled in a certain way. It has to be destroyed in a certain way. You have to have a certain container to place it in. It has to be removed in a certain amount of time.
The college could also mandate that only so much goes out, and that maybe there should be a follow-up call as part of the annual medication review: “You've had this controlled substance in your possession based on a prescription from six months ago. Are you still using it? Do you need it? If not, it needs to come to us.”
For record-keeping, we're looking at a complex situation with maybe no simple answer.