I would say that in general, in the prescription pharmaceutical industry, you're dealing with entities that are highly regulated. All manufacturers, wholesalers, distributors, and retail pharmacies are licensed. They need establishment licences, and they are inspected by Health Canada. For the physical products coming into and being sold through legitimate trade in Canada, the products are generally safe.
I think where we've had more problem with pharmaceuticals has been with online sales. We know that the RCMP and others have done a very good job, as Mr. Lipkus and others have said, in attacking that problem and addressing it.
I'm not really answering your question on whether shippers or distributors should be liable, but I think in general they deal with parties who are registered and need establishment licences. If you're dealing with anyone other than that, you probably would and should be liable.